Name

MIZOKAWA, Takashi

Official Title

Professor

Affiliation

(School of Advanced Science and Engineering)

Contact Information

Mail Address

Mail Address
mizokawa@waseda.jp

URL

Web Page URL

http://www.f.waseda.jp/mizokawa/

Pure
Scival
Grant-in-aids for Scientific Researcher Number
90251397
ORCID ID
0000-0002-7682-2348

Sub-affiliation

Sub-affiliation

Faculty of Science and Engineering(Graduate School of Advanced Science and Engineering)

Affiliated Institutes

各務記念材料技術研究所

兼任研究員 2017-2018

理工学術院総合研究所(理工学研究所)

兼任研究員 2018-

ホリスティック物理学研究所

研究所員 2015-2019

ホリスティック物理学研究所

研究所員 2019-

Educational background・Degree

Degree

Doctor of Science Thesis University of Tokyo Condensed matter physics II

Academic Society Joined

The Physical Society of Japan

The Japanese Society for Synchrotron Radiation Research

Research Field

Keywords

Strongly correlated electron systems, photoemission spectroscopy

Grants-in-Aid for Scientific Research classification

Mathematical and physical sciences / Physics / Condensed matter physics I

Mathematical and physical sciences / Physics / Condensed matter physics II

Paper

Metallic phase in stoichiometric CeOBiS 2 revealed by space-resolved ARPES

Sugimoto, T.; Sugimoto, T.; Sugimoto, T.; Paris, E.; Wakita, T.; Terashima, K.; Yokoya, T.; Barinov, A.; Kajitani, J.; Higashinaka, R.; Matsuda, T. D.; Aoki, Y.; Mizokawa, T.; Saini, N. L.

Scientific Reports 8(1) 2018/12-2018/12

DOIScopus

Detail

Outline:© 2018 The Author(s). Recently CeOBiS 2 system without any fluorine doping is found to show superconductivity posing question on its origin. Using space resolved ARPES we have found a metallic phase embedded in the morphological defects and at the sample edges of stoichiometric CeOBiS 2 . While bulk of the sample is semiconducting, the embedded metallic phase is characterized by the usual electron pocket at X point, similar to the Fermi surface of doped BiS 2 -based superconductors. Typical size of the observed metallic domain is larger than the superconducting correlation length of the system suggesting that the observed superconductivity in undoped CeOBiS 2 might be due to this embedded metallic phase at the defects. The results also suggest a possible way to develop new systems by manipulation of the defects in these chalcogenides with structural instability.

V 2p core-level spectroscopy of V2+/V3+mixed valence AV10O15(A = Ba, Sr) and Ba0.9Sr0.1V13O18

Dash, S.; Kajita, T.; Yoshino, T.; Saini, N. L.; Katsufuji, T.; Mizokawa, T.

Journal of Electron Spectroscopy and Related Phenomena 223p.11 - 202018/02-2018/02

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Detail

ISSN:03682048

Outline:© 2017 Elsevier B.V. We have studied the surface electronic structure of AV 10 O 15 (A = Ba, Sr) and Ba 0.9 Sr 0.1 V 13 O 18 by using x-ray photoemission spectroscopy (XPS). The V 2p XPS shows multiple peaks associated with the charge fluctuation in the system. The relative intensity of each valence component can be extracted by Gaussian and Voigt fittings. The result strongly depends on the number of Gaussians/Voigts. In BaV 10 O 15 and Ba 0.9 Sr 0.1 V 13 O 18 , the surface state has more V 3+ than the bulk. In addition to the presence of surface V 3+ , the V 2.5+ in AV 10 O 15 (A = Ba, Sr) and V 2+ in Ba 0.9 Sr 0.1 V 13 O 18 systems are observed even in the surface sensitive XPS. The number of Gaussians/Voigts should be as large as four for the V 2p 3/2 , in order to obtain the results consistent with the bulk sensitive HAXPES study.

Systematic charge distribution changes in Bi- and Pb-3d transition metal perovskites

Azuma, Masaki; Sakai, Yuki; Nishikubo, Takumi; Mizumaki, Masaichiro; Watanuki, Tetsu; Mizokawa, Takashi; Oka, Kengo; Hojo, Hajime; Naka, Makoto

Dalton Transactions 47(5) p.1371 - 13772018/01-2018/01

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ISSN:14779226

Outline:© 2018 The Royal Society of Chemistry. Charge distribution changes in Bi- and Pb-3d transition metal perovskite type oxides were examined by comprehensive precise structural analysis, spectroscopy, and theoretical investigations. The change in the depth of the d level of the transition metal caused the intermetallic charge transfer. A temperature-induced charge-transfer transition in chemically modified BiNiO 3 results in technologically important negative thermal expansion.

Interplay between spin-orbit interaction and stripe-type charge-orbital order of IrTe2

Ootsuki, Daiki; Ishii, Hiroyuki; Kudo, Kazutaka; Nohara, Minoru; Arita, Masashi; Namatame, Hirofumi; Taniguchi, Masaki; Saini, Naurang L.; Mizokawa, Takashi

Journal of Physics and Chemistry of Solids 2018/01-2018/01

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ISSN:00223697

Outline:© 2018 Elsevier Ltd. We have studied the electronic structure of the stripe-type charge-orbital ordered phase of IrTe 2 by means of angle-resolved photoemission spectroscopy. An electron pocket at the Brillouin zone boundary and hole Fermi surfaces around its center are clearly observed in agreement with the band structure calculation for the stripe-type charge-orbital ordered phase. The present study indicates that the hole and electron Fermi surfaces can survive due to the strong Te 5p spin-orbit coupling even under the charge-orbital order. The participant of the Te 5p orbitals to the conduction band provides an interesting interplay between the charge-orbital order and the spin-orbit interaction in IrTe 2 .

Distinct local structure of superconducting Ca10M4As8(Fe2As2)5 (M=Pt,Ir)

Paris, E.; Wakita, T.; Proux, O.; Proux, O.; Yokoya, T.; Kudo, K.; Mitsuoka, D.; Kimura, T.; Fujimura, K.; Nishimoto, N.; Ioka, S.; Nohara, M.; Mizokawa, T.; Saini, N. L.

Physical Review B 96(22) 2017/12-2017/12

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ISSN:24699950

Outline:© 2017 American Physical Society. We have studied the local structure of superconducting Ca10Pt4As8(Fe2As2)5 (Pt10418) and Ca10Ir4As8(Fe2As2)5 (Ir10418) iron arsenides, showing different transition temperatures (Tc=38 and 16 K, respectively), by polarized Fe K-edge extended x-ray absorption fine-structure measurements. Despite the similar average crystal structures, the local structures of the FeAs4 tetrahedra in the two compounds are found to be very different. The FeAs4 in Pt10418 is close to a regular tetrahedron, while it deviates largely in Ir10418. The Fe-Fe correlations in the two compounds are characterized by similar bond-length characteristics; however, the static disorder in Pt10418 is significantly lower than that in Ir10418. The results suggest that the optimized local structure and reduced disorder are the reasons for higher Tc and well-defined electronic states in Pt10418 unlike Ir10418 showing the coexistence of glassy and normal electrons at the Fermi surface, and hence provide direct evidence of the local-structure-driven optimization of the electronic structure and superconductivity in iron arsenides.

A novel one-dimensional electronic state at IrTe2Surface

Ootsuki, Daiki; Ishii, Hiroyuki; Kudo, Kazutaka; Nohara, Minoru; Takahashi, Masaya; Horio, Masafumi; Fujimori, Atsushi; Yoshida, Teppei; Arita, Masashi; Anzai, Hiroaki; Namatame, Hirofumi; Taniguchi, Masaki; Taniguchi, Masaki; Saini, Naurang L.; Mizokawa, Takashi

Journal of the Physical Society of Japan 86(12) 2017/12-2017/12

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ISSN:00319015

Outline:© 2017 The Physical Society of Japan. Highly one-dimensional (1D) Fermi sheets are realized at the surface of a layered Ir telluride IrTe 2 which exhibits a stripe-type charge and orbital order below ∼280 K. The 1D Fermi sheets appear in the low temperature range where the stripe order is well established. The 1D Fermi sheets are truncated by the bulk Fermi surfaces, and the spectral weight suppression at the Fermi level deviates from the typical Tomonaga–Luttinger behavior. The 1D band runs along the stripe and is accompanied by several branches which can be derived from the quantization in the perpendicular direction.

Electronic structure and polar catastrophe at the surface of Lix CoO2 studied by angle-resolved photoemission spectroscopy

Okamoto, Y.; Matsumoto, R.; Yagihara, T.; Iwai, C.; Miyoshi, K.; Takeuchi, J.; Horiba, K.; Kobayashi, M.; Ono, K.; Kumigashira, H.; Saini, N. L.; Mizokawa, T.

Physical Review B 96(12) 2017/09-2017/09

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ISSN:24699950

Outline:© 2017 American Physical Society. We report an angle-resolved photoemission spectroscopy (ARPES) study of LixCoO2 single crystals which have a hole-doped CoO2 triangular lattice. Similar to NaxCoO2, the Co 3da1g band crosses the Fermi level with strongly renormalized band dispersion while the Co 3deg′ bands are fully occupied in LixCoO2 (x=0.46 and 0.71). At x=0.46, the Fermi surface area is consistent with the bulk hole concentration indicating that the ARPES result represents the bulk electronic structure. On the other hand, at x=0.71, the Fermi surface area is larger than the expectation which can be associated with the inhomogeneous distribution of Li reported in the previous scanning tunneling microscopy study by Iwaya et al. [Phys. Rev. Lett. 111, 126104 (2013)PRLTAO0031-900710.1103/PhysRevLett.111.126104]. However, the Co 3d peak is systematically shifted towards the Fermi level with hole doping excluding phase separation between hole rich and hole poor regions in the bulk. Therefore, the deviation of the Fermi surface area at x=0.71 can be attributed to hole redistribution at the surface avoiding polar catastrophe. The bulk Fermi surface of Co 3da1g is very robust around x=0.5 even in the topmost CoO2 layer due to the absence of the polar catastrophe.

Orbital order and fluctuations in the two-leg ladder materials BaFe2X3 (X= S and Se) and CsFe2Se3

Takubo, Kou; Yokoyama, Yuichi; Wadati, Hiroki; Iwasaki, Shun; Mizokawa, Takashi; Boyko, Teak; Sutarto, Ronny; He, Feizhou; Hashizume, Kazuki; Imaizumi, Satoshi; Aoyama, Takuya; Imai, Yoshinori; Ohgushi, Kenya

Physical Review B 96(11) 2017/09-2017/09

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ISSN:24699950

Outline:© 2017 American Physical Society. The electronic structure of BaFe2X3 (X = S and Se) and CsFe2Se3 in which two-leg ladders are formed by the Fe sites are studied by means of x-ray absorption and resonant inelastic x-ray scattering spectroscopy. The x-ray absorption spectra at the Fe L edges for BaFe2X3 exhibit two components, indicating that itinerant and localized Fe 3d sites coexist. Substantial x-ray linear dichroism is observed in polarization dependent spectra, indicating the existence of orbital order or fluctuation in the Fe ladder even above the Néel temperature TN. Direct exchange interaction along the legs of the Fe ladder stabilizes the orbital and antiferromagnetic orders in BaFe2S3, while the ferromagnetic molecular orbitals are realized between the rungs in CsFe2Se3.

Ultrafast Electronic Band Gap Control in an Excitonic Insulator

Mor, Selene; Herzog, Marc; Herzog, Marc; GoleŽ, Denis; Werner, Philipp; Eckstein, Martin; Katayama, Naoyuki; Nohara, Minoru; Takagi, Hide; Takagi, Hide; Mizokawa, Takashi; Monney, Claude; Stähler, Julia

Physical Review Letters 119(8) 2017/08-2017/08

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ISSN:00319007

Outline:© 2017 American Physical Society. We report on the nonequilibrium dynamics of the electronic structure of the layered semiconductor Ta2NiSe5 investigated by time- and angle-resolved photoelectron spectroscopy. We show that below the critical excitation density of FC=0.2 mJ cm-2, the band gap narrows transiently, while it is enhanced above FC. Hartree-Fock calculations reveal that this effect can be explained by the presence of the low-temperature excitonic insulator phase of Ta2NiSe5, whose order parameter is connected to the gap size. This work demonstrates the ability to manipulate the band gap of Ta2NiSe5 with light on the femtosecond time scale.

Orbital-dependent band renormalization in BaNi2(As1−xPx)2(x = 0.00 and 0.092)

Noda, Tomohiro; Kudo, Kazutaka; Takasuga, Masaya; Nohara, Minoru; Sugimoto, Takuya; Ootsuki, Daiki; Kobayashi, Masaki; Horiba, Koji; Ono, Kanta; Kumigashira, Hiroshi; Fujimori, Atsushi; Saini, Naurang L.; Mizokawa, Takashi

Journal of the Physical Society of Japan 86(6) 2017/06-2017/06

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ISSN:00319015

Outline:© 2017 The Physical Society of Japan We have studied the multi-band electronic structure of BaNi 2 (As 1 − x P x ) 2 (x = 0.00 and 0.092) in which the P substitution suppresses unusual Ni–Ni zigzag bond order and induces strong coupling superconductivity. At x = 0.092, all the Fermi surfaces predicted by the ab-initio band calculations are successfully identified including the small electron pocket around the Z point. Interestingly, whereas the Ni 3d xy and x 2 − y 2 bands crossing E F agree with the band calculations, the Ni 3d yz=zx bands around 1 eV below the Fermi level (E F ) are moderately renormalized similar to those in the Fe-based superconductors. The orbital-dependent band renormalization in BaNi 2 (As 1 − x P x ) 2 indicates that the less correlated xy and x 2 − y 2 bands play important roles in the strong coupling superconductivity. Across the Ni–Ni bond order at x = 0.00, the less correlated Ni 3d xy and x 2 − y 2 bands near E F are selectively reconstructed across the Ni–Ni bond order. The band reconstruction is consistent with the orbital-selective Peierls instability proposed by Streltsov and Khomskii [Phys. Rev. B 89, 161112(R) (2014)], in which the itinerant orbital sector governs the structural instability and fluctuations.

Orbital-Dependent Band Renormalization in BaNi2(As1−xPx)2(x= 0.00 and 0.092)

Noda Tomohiro;Kudo Kazutaka;Takasuga Masaya;Nohara Minoru;Sugimoto Takuya;Ootsuki Daiki;Kobayashi Masaki;Horiba Koji;Ono Kanta;Kumigashira Hiroshi;Fujimori Atsushi;Saini Naurang L.;Mizokawa Takashi

Journal of the Physical Society of Japan 86(6) 2017/05-2017/05

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Detail

ISSN:0031-9015

Electronic properties of Ba1-xSrx V13 O18 (x=0,0.2,1) studied using hard x-ray photoelectron spectroscopy

Dash, S.; Okawa, M.; Kajita, T.; Yoshino, T.; Shimoyama, R.; Takahashi, K.; Takahashi, Y.; Takayanagi, R.; Saitoh, T.; Ootsuki, D.; Yoshida, T.; Ikenaga, E.; Saini, N. L.; Katsufuji, T.; Mizokawa, T.

Physical Review B 95(19) 2017/05-2017/05

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ISSN:24699950

Outline:© 2017 American Physical Society. We have studied the electronic structure of Ba1-xSrxV13O18 (x=0,0.2,1) at different temperatures across the trimerization and charge-order transitions using hard x-ray photoemission spectroscopy (HAXPES). The V 2p HAXPES indicates V2+/V3+ charge order and fluctuation in the high-temperature tetramer phase, low-temperature trimer phase, and intermediate-temperature charge-order phase in the series of x=0,0.2,1. In the valence-band HAXPES, although the spectral weight at the Fermi level tends to be suppressed in all the phases due to strong charge order or fluctuation, it increases in the trimer phase at x=0.2, in agreement with the decrease of resistivity and the increase of itinerant electrons in the trimer phase. Interestingly, in the most conducting x=1 without the charge-order phase, the spectral weight at the Fermi level is strongly suppressed even in the trimer phase, indicating that charge fluctuation in the trimer phase is different between x=0.2 and 1.

Role of the local structure in superconductivity of Lao0.5F0.5BiS2-xSexsystem

Paris, E.; Paris, E.; Mizuguchi, Y.; Hacisalihoglu, M. Y.; Hacisalihoglu, M. Y.; Hiroi, T.; Joseph, B.; Aquilanti, G.; Miura, O.; Mizokawa, T.; Saini, N. L.

Journal of Physics Condensed Matter 29(14) 2017/03-2017/03

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ISSN:09538984

Outline:© 2017 IOP Publishing Ltd. We have studied the local structure of LaO 0.5 F 0.5 BiS 2-x Se x by Bi L 1 -edge extended x-ray absorption fine structure (EXAFS). We find a significant effect of Se substitution on the local atomic correlations with a gradual elongation of average in-plane Bi-S bondlength. The associated mean square relative displacement, measuring average local distortions in the BiS 2 plane, hardly shows any change for small Se substitution, but decreases significantly for . The Se substitution appears to suppress the local distortions within the BiS 2 plane that may optimize in-plane orbital hybridization and hence the superconductivity. The results suggest that the local structure of the BiS 2 -layer is one of the key ingredients to control the physical properties of the BiS 2 -based dichalcogenides.

A-Site and B-Site Charge Orderings in an s-d Level Controlled Perovskite Oxide PbCoO3

Sakai, Yuki; Yang, Junye; Yu, Runze; Hojo, Hajime; Yamada, Ikuya; Miao, Ping; Lee, Sanghyun; Torii, Shuki; Kamiyama, Takashi; Kamiyama, Takashi; Ležaić, Marjana; Bihlmayer, Gustav; Mizumaki, Masaichiro; Komiyama, Jun; Mizokawa, Takashi; Yamamoto, Hajime; Nishikubo, Takumi; Hattori, Yuichiro; Oka, Kengo; Yin, Yunyu; Dai, Jianhong; Li, Wenmin; Ueda, Shigenori; Ueda, Shigenori; Aimi, Akihisa; Mori, Daisuke; Inaguma, Yoshiyuki; Hu, Zhiwei; Uozumi, Takayuki; Jin, Changqing; Jin, Changqing; Jin, Changqing; Long, Youwen; Long, Youwen; Azuma, Masaki

Journal of the American Chemical Society 139(12) p.4574 - 45812017/03-2017/03

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ISSN:00027863

Outline:© 2017 American Chemical Society. Perovskite PbCoO 3 synthesized at 12 GPa was found to have an unusual charge distribution of Pb 2+ Pb 4+ 3 Co 2+ 2 Co 3+ 2 O 12 with charge orderings in both the A and B sites of perovskite ABO 3 . Comprehensive studies using density functional theory (DFT) calculation, electron diffraction (ED), synchrotron X-ray diffraction (SXRD), neutron powder diffraction (NPD), hard X-ray photoemission spectroscopy (HAXPES), soft X-ray absorption spectroscopy (XAS), and measurements of specific heat as well as magnetic and electrical properties provide evidence of lead ion and cobalt ion charge ordering leading to Pb 2+ Pb 4+ 3 Co 2+ 2 Co 3+ 2 O 12 quadruple perovskite structure. It is shown that the average valence distribution of Pb 3.5+ Co 2.5+ O 3 between Pb 3+ Cr 3+ O 3 and Pb 4+ Ni 2+ O 3 can be stabilized by tuning the energy levels of Pb 6s and transition metal 3d orbitals.

Unusual valence state and metal-insulator transition in BaV10 O15 probed by hard x-ray photoemission spectroscopy

Yoshino, T.; Okawa, M.; Kajita, T.; Dash, S.; Shimoyama, R.; Takahashi, K.; Takahashi, Y.; Takayanagi, R.; Saitoh, T.; Ootsuki, D.; Yoshida, T.; Ikenaga, E.; Saini, N. L.; Katsufuji, T.; Mizokawa, T.

Physical Review B 95(7) 2017/02-2017/02

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ISSN:24699950

Outline:© 2017 American Physical Society. We have studied the electronic structure of BaV10O15 across the metal-insulator transition with V trimerization by means of hard-x-ray photoemission spectroscopy (HAXPES) and mean-field calculations. The V 2p HAXPES indicates V2.5+-V3+ charge fluctuation in the metallic phase, and V2+-V3+ charge order in the insulating phase. The V2.5+-V3+ charge fluctuation is consistent with the mean-field solution where a V 3d a1g electron is shared by two V sites with face-sharing VO6 octahedra. The valence-band HAXPES of the metallic phase exhibits pseudogap opening at the Fermi level associated with the charge fluctuation, and a band gap ∼200 meV is established in the insulating phase due to the switching of charge correlation.

Electronic structure of self-doped layered Eu3 F4Bi2 S4 material revealed by x-ray absorption spectroscopy and photoelectron spectromicroscopy

Paris, E.; Sugimoto, T.; Sugimoto, T.; Sugimoto, T.; Wakita, T.; Barinov, A.; Terashima, K.; Kandyba, V.; Proux, O.; Kajitani, J.; Higashinaka, R.; Matsuda, T. D.; Aoki, Y.; Yokoya, T.; Mizokawa, T.; Saini, N. L.

Physical Review B 95(3) 2017/01-2017/01

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ISSN:24699950

Outline:© 2017 American Physical Society. We have studied the electronic structure of Eu3F4Bi2S4 using a combination of Eu L3-edge x-ray absorption spectroscopy (XAS) and space-resolved angle-resolved photoemission spectroscopy (ARPES). From the Eu L3-edge XAS, we have found that the Eu in this system is in mixed valence state with coexistence of Eu2+/Eu3+. The bulk charge doping was estimated to be ∼0.3 per Bi site in Eu3F4Bi2S4, which corresponds to the nominal x in a typical REO1-xFxBiS2 system (RE: rare-earth elements). From the space-resolved ARPES, we have ruled out the possibility of any microscale phase separation of Eu valence in the system. Using a microfocused beam we have observed the band structure as well as the Fermi surface that appeared similar to other compounds of this family with disconnected rectangular electronlike pockets around the X point. The Luttinger volume analysis gives the effective carrier to be 0.23 electrons per Bi site in Eu3F4Bi2S4, indicating that the system is likely to be in the underdoped region of its superconducting phase diagram.

High resolution x-ray absorption and emission spectroscopy of LixCoO2 single crystals as a function delithiation

Simonelli, L.; Simonelli, L.; Paris, E.; Paris, E.; Iwai, C.; Miyoshi, K.; Takeuchi, J.; Mizokawa, T.; Mizokawa, T.; Saini, N. L.

Journal of Physics Condensed Matter 29(10) 2017/01-2017/01

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ISSN:09538984

Outline:© 2017 IOP Publishing Ltd. The effect of delithiation in Li x CoO 2 is studied by high resolution Co K-edge x-ray absorption and x-ray emission spectroscopy. Polarization dependence of the x-ray absorption spectra on single crystal samples is exploited to reveal information on the anisotropic electronic structure. We find that the electronic structure of Li x CoO 2 is significantly affected by delithiation in which the Co ions oxidation state tending to change from 3+ to 4+. The Co intersite (intrasite) 4p-3d hybridization suffers a decrease (increase) by delithiation. The unoccupied 3d t 2g orbitals with a 1g symmetry, containing substantial O 2p character, hybridize isotropically with Co 4p orbitals and likely to have itinerant character unlike anisotropically hybridized 3d e g orbitals. Such a peculiar electronic structure could have significant effect on the mobility of Li in Li x CoO 2 cathode and hence the battery characteristics.

Bayesian approach to effective model of NiGa2S4 triangular lattice with Boltzmann factor

Takenaka, Hikaru; Nagata, Kenji; Nagata, Kenji; Nagata, Kenji; Mizokawa, Takashi; Okada, Masato; Okada, Masato

Journal of the Physical Society of Japan 85(12) 2016/12-2016/12

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ISSN:00319015

Outline:©2016 The Physical Society of Japan.We propose a method for inducting the Boltzmann factor to extract effective classical spin Hamiltonians from meanfield-type electronic structural calculations by means of the Bayesian inference. This method enables us to compare electronic structural calculations with experiments according to the classical model at a finite temperature. Application of this method to the unrestricted Hartree-Fock calculations for NiGa2S4 led to the estimation that the superexchange interaction between the nearest neighbor sites is ferromagnetic at low temperature, which is consistent with magnetic experiment results. This supports the theory that competition between the antiferromagnetic third neighbor interaction and ferromagnetic nearest neighbor interaction may lead to the quantum spin liquid in NiGa2S4.

Bayesian Approach to Effective Model of NiGa2S4Triangular Lattice with Boltzmann Factor

Takenaka Hikaru;Nagata Kenji;Mizokawa Takashi;Okada Masato

Journal of the Physical Society of Japan 85(12) 2016/11-2016/11

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ISSN:0031-9015

Localized and mixed valence state of Ce 4f in superconducting and ferromagnetic CeO1-x FxBiS2 revealed by x-ray absorption and photoemission spectroscopy

Sugimoto, T.; Sugimoto, T.; Ootsuki, D.; Ootsuki, D.; Paris, E.; Paris, E.; Iadecola, A.; Salome, M.; Schwier, E. F.; Iwasawa, H.; Shimada, K.; Asano, T.; Higashinaka, R.; Matsuda, T. D.; Aoki, Y.; Saini, N. L.; Mizokawa, T.

Physical Review B - Condensed Matter and Materials Physics 94(8) 2016/08-2016/08

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ISSN:10980121

Outline:©2016 American Physical Society.We have performed Ce L3-edge x-ray absorption spectroscopy (XAS) and Ce 4d-4f resonant photoemission spectroscopy (PES) on single crystals of CeO1-xFxBiS2 for x=0.0 and 0.5 in order to investigate the Ce 4f electronic states. In Ce L3-edge XAS, a mixed valence of Ce was found in the x=0.0 sample, and F doping suppressed it, which is consistent with the results on polycrystalline samples. As for resonant PES, we found that the Ce 4f electrons in both x=0.0 and 0.5 systems respectively formed a flat band at 1.0 and 1.4 eV below the Fermi level and there was no contribution to the Fermi surfaces. Interestingly, Ce valence in CeOBiS2 deviates from Ce3+ even though Ce 4f electrons are localized, indicating the Ce valence is not in a typical valence fluctuation regime. We assume that localized Ce 4f in CeOBiS2 is mixed with unoccupied Bi 6pz, which is consistent with a previous local structural study. Based on the analysis of the Ce L3-edge XAS spectra using Anderson's impurity model calculation, we found that the transfer integral becomes smaller, increasing the number of Ce 4f electrons upon the F substitution for O.

A study of temperature dependent local atomic displacements in a Ba(Fe1-xCox)2As2 superconductor

Hacisalihoglu, M. Y.; Hacisalihoglu, M. Y.; Hacisalihoglu, M. Y.; Paris, E.; Paris, E.; Joseph, B.; Joseph, B.; Simonelli, L.; Sato, T. J.; Mizokawa, T.; Saini, N. L.

Physical Chemistry Chemical Physics 18(13) p.9029 - 90352016/04-2016/04

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ISSN:14639076

Outline:© the Owner Societies 2016.We have studied the local structure of a Ba(Fe1-xCox)2As2 superconductor using temperature dependent extended X-ray absorption fine structure (EXAFS) measurements. Polarized EXAFS at the Fe K-edge on an optimally doped (x = 0.06) single crystal has permitted us to determine atomic displacements across the superconducting transition temperature (Tc). The Fe-As bondlength hardly shows any change with temperature; however, the Fe-Fe sublattice reveals a sharp anomaly across Tc, indicated by a significant drop in mean square relative displacements, similar to the one known for cuprates and A15-type superconductors. We have also found a large atomic disorder around the substituted Co, revealed by polarized Co K-edge EXAFS measurements. The Co-Fe/Co bonds are more flexible than the Fe-Fe bonds with the As-height in Co-containing tetrahedra being larger than the one in FeAs4. The results suggest that the local Fe-Fe bondlength fluctuations and the atomic disorder in this sub-lattice should have some important role in the superconductivity of Ba(Fe1-xCox)2As2 pnictides.

Pressure dependence of the local structure of iridium ditelluride across the structural phase transition

Paris, E.; Paris, E.; Joseph, B.; Joseph, B.; Iadecola, A.; Marini, C.; Ishii, H.; Kudo, K.; Pascarelli, S.; Nohara, M.; Mizokawa, T.; Mizokawa, T.; Saini, N. L.

Physical Review B - Condensed Matter and Materials Physics 93(13) 2016/04-2016/04

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ISSN:10980121

Outline:© 2016 American Physical Society.The local structure of IrTe2 has been studied by iridium L3-edge x-ray absorption spectroscopy (XAS) measurements as a function of pressure, performed at two temperatures (100 and 295 K) across the structural phase transition at ∼270 K. Extended x-ray absorption fine structure (EXAFS) and x-ray absorption near-edge structure (XANES) spectra show pressure-dependent anomalies, suggesting phase transitions that are characterized by different local atomic displacements. The high-temperature phase of IrTe2 (trigonal at 295 K) reveals a clear anomaly in the Ir-Te correlations at ∼4 GPa, while the low-temperature phase (at 100 K) shows a smaller change at ∼6 GPa, likely to be associated with transitions in lower-symmetry phases. XANES spectra, measuring higher-order atomic correlations, also show nonlinear pressure dependence in the local geometry at the anomalous pressures. These nonlinear changes suggest that IrTe2 goes through lower local symmetry phases with increasing pressure.

Temperature Dependent Local Structure of NaxCoO2 Cathode Material for Rechargeable Sodium-Ion Batteries

Olszewski, Wojciech; Olszewski, Wojciech; Ávila Pérez, Marta; Marini, Carlo; Paris, Eugenio; Paris, Eugenio; Wang, Xianfen; Iwao, Tatsumi; Okubo, Masashi; Yamada, Atsuo; Mizokawa, Takashi; Saini, Naurang Lal; Simonelli, Laura

Journal of Physical Chemistry C 120(8) p.4227 - 42322016/03-2016/03

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ISSN:19327447

Outline:© 2016 American Chemical Society.We have investigated the local structure of differently charged NaxCoO2 cathode material as a function of temperature by Co K-edge X-ray absorption fine structure (EXAFS) measurements. We have found that the charge/discharge process has a direct effect on the bond characteristics of the cathode in the Na-ion batteries. The results reveal that the local Co-O bonds get softer, while the Co-Co bonds hardly show any change during discharge (sodiation). The present study underlines the key role of local atomic displacements in diffusion and the reversibility of ions in cathodes for batteries and points toward the feasibility of NaxCoO2 to be used as a cathode material. The results are discussed in comparison with the lithiation/delithiation of LixCoO2 battery materials.

Mesoscopic Stripes in Antiferromagnetic Fe Chalcogenide Probed by Scanning Photoelectron Spectromicroscopy

Mizokawa Takashi;Bendele Markus;Barinov Alexei;Iadecola Antonella;Joseph Boby;Noji Takashi;Koike Yoji;Saini Naurang L.

Journal of the Physical Society of Japan 85(3) 2016/02-2016/02

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ISSN:0031-9015

Determination of the local structure of CsBi4-: XPbxTe6 (x = 0, 0.5) by X-ray absorption spectroscopy

Wakita, Takanori; Paris, Eugenio; Paris, Eugenio; Mizokawa, Takashi; Hacisalihoǧlu, Muammer Yasin; Hacisalihoǧlu, Muammer Yasin; Terashima, Kensei; Okazaki, Hiroyuki; Proux, Olivier; Proux, Olivier; Kieffer, Isabelle; Kieffer, Isabelle; Lahera, Eric; Lahera, Eric; Del Net, William; Del Net, William; Olivi, Luca; Takano, Yoshihiko; Muraoka, Yuji; Yokoya, Takayoshi; Saini, Naurang L.

Physical Chemistry Chemical Physics 18(36) p.25136 - 251422016/01-2016/01

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ISSN:14639076

Outline:© 2016 the Owner Societies.We have studied the local structure and valence electronic unoccupied states of thermoelectric CsBi4Te6 and superconducting CsBi3.5Pb0.5Te6 (Tc ∼ 3 K) by extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) measurements. The Bi-L3 edge EXAFS reveals wide Bi-Te distance distribution for both compounds indicating complex atomic arrangements in the studied system. The mean square relative displacements (MSRDs) of the Bi-Te bond distances appear largely increased in Pb substituted system due to larger overall local disorder, however, one of the Bi-Te bonds shows a reduced disorder. On the other hand, the Bi-L3 edge XANES is hardly affected by Pb substitution while the Te-L1 edge XANES reveals increased density of unoccupied Te 5p states. This suggests that the carriers introduced by the Pb substitution in CsBi4-xPbxTe6 preferentially goes on Te sites. Similarly, the Cs-L3 edge XANES also shows small changes due to Pb-substitution and reduced local disorder indicated by the reduced width of the Cs-L3 edge white line. We have also shown that the X-ray photoemission spectroscopy (XPS) measurements on various electronic core levels are in a qualitative agreement with the XANES results. These findings are consistent with carrier doping and a reduced disorder in one direction to be likely factors to drive the thermoelectric CsBi4Te6 into a bulk superconductor by Pb-substitution in CsBi4-xPbxTe6.

Determination of the local structure of CsBi4-xPbxTe6 (x=0, 0.5) by X-ray absorption spectroscopy

Wakita, Takanori;Paris, Eugenio;Mizokawa, Takashi;Hacisalihoglu, Muammer Yasin;Terashima, Kensei;Okazaki, Hiroyuki;Proux, Olivier;Kieffer, Isabelle;Lahera, Eric;Del Net, William;Olivi, Luca;Takano, Yoshihiko;Muraoka, Yuji;Yokoya, Takayoshi;Saini, Naurang L.

PHYSICAL CHEMISTRY CHEMICAL PHYSICS 18(36) p.25136 - 251422016-2016

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ISSN:1463-9076

Bayesian Approach to Effective Model of NiGa2S4 Triangular Lattice with Boltzmann Factor

Takenaka, Hikaru;Nagata, Kenji;Mizokawa, Takashi;Okada, Masato

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 85(12) 2016-2016

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ISSN:0031-9015

19aBN-3 Resonant x-ray scattering of Ir_<1-x>Pt_xTe_2

Takubo K.;Wadati H.;Ootsuki D.;Mizokawa T.;Sutarto R.;He F.;Ishii K.;Yamasaki Y.;Nakao H.;Murakami Y.;Pyon S.;Kudo K.;Matsuo G.;Ishii H.;Kobayashi M.;Nohara M.

Meeting Abstracts of the Physical Society of Japan 71(0) 2016-2016

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ISSN:2189079X

19aBQ-5 Electronic structure and spin-orbital order of BaFe_2Se_3

Iwasaki S.;Noda T.;Mizokawa T.;Aoyama T.;Hashizume K.;Ohgushi K.;Kobayashi M.;Horiba K.;Ono K.;Kumigashira H.

Meeting Abstracts of the Physical Society of Japan 71(0) 2016-2016

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ISSN:2189079X

19pBM-2 Electronic structure and orbital-charge order in vanadium oxides with triangular lattice

Yoshino T.;N. Tomohiro;Mizokawa T.;Okawa M.;Saitoh T.;Kobayashi M.;Horiba K.;Ono K.;Kumigashia H.;Kajita T.;Katsufji T.

Meeting Abstracts of the Physical Society of Japan 71(0) 2016-2016

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ISSN:2189079X

21aPS-60 Photoemission study of Li_xCoO_2

Okamoto Y.;Noda T.;Mizokawa T.;Iwai C.;Miyoshi K.;Takeuchi J.;Kobayashi M.;Horiba K.;Ono K.;Kumigashira H.

Meeting Abstracts of the Physical Society of Japan 71(0) 2016-2016

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ISSN:2189079X

19pBM-2 Electronic structure and orbital-charge order in vanadium oxides with triangular lattice

Yoshino T.;N. Tomohiro;Mizokawa T.;Okawa M.;Saitoh T.;Kobayashi M.;Horiba K.;Ono K.;Kumigashia H.;Kajita T.;Katsufji T.

Meeting Abstracts of the Physical Society of Japan 71(0) 2016-2016

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19aBQ-5 Electronic structure and spin-orbital order of BaFe_2Se_3

Iwasaki S.;Noda T.;Mizokawa T.;Aoyama T.;Hashizume K.;Ohgushi K.;Kobayashi M.;Horiba K.;Ono K.;Kumigashira H.

Meeting Abstracts of the Physical Society of Japan 71(0) 2016-2016

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19aBN-3 Resonant x-ray scattering of Ir_<1-x>Pt_xTe_2

Takubo K.;Wadati H.;Ootsuki D.;Mizokawa T.;Sutarto R.;He F.;Ishii K.;Yamasaki Y.;Nakao H.;Murakami Y.;Pyon S.;Kudo K.;Matsuo G.;Ishii H.;Kobayashi M.;Nohara M.

Meeting Abstracts of the Physical Society of Japan 71(0) 2016-2016

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21aPS-60 Photoemission study of Li_xCoO_2

Okamoto Y.;Noda T.;Mizokawa T.;Iwai C.;Miyoshi K.;Takeuchi J.;Kobayashi M.;Horiba K.;Ono K.;Kumigashira H.

Meeting Abstracts of the Physical Society of Japan 71(0) 2016-2016

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19aPS-27 Spin orbital order of BaFe2Se3 and CsFe_2Se_3 studied by multi orbital d-p model calculation

Iwasaki Shun;Mizokawa Takashi

70(2) 2015/09-2015/09

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ISSN:2189079X

19aPS-97 Charge-orbital ordering in Ba_2Ti_<13>O_<22> studied by multi-band d-p model calculation

Yoshino Tsubasa;Mizokawa Takashi

70(2) 2015/09-2015/09

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ISSN:2189079X

16pBB-7 Charge-transfer instability in strongly-correlated transition-metal compounds probed by synchrotron radiation spectroscopy

Mizokawa Takashi

70(2) p.1545 - 15462015/09-2015/09

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ISSN:2189079X

16aDB-5 Angle-resolved photoemission spectroscopy of BaNi_2(As_<1-x>Px)_2

Noda T.;Ootsuki D.;Sugimoto T.;Horio M.;Fujimori A.;Kobayashi M.;Horiba K.;Ono K.;Kumigashira H.;Kudo K.;Takasuga M.;Nohara M.;Saini N. L.;Mizokawa T.

70(2) 2015/09-2015/09

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ISSN:2189079X

16pCD-1 Direct Observation of Superconducting Gaps in Ir1-xPtxTe2 by Laser-ARPES

Ootsuki D.;Mizokawa T.;Saini N. L.;Ota Y.;Yamamoto H.;Hashimoto T.;Okazaki K.;Shin S.;Fujimori A.;Toriyama T.;Konishi T.;Ohta Y.;Pyon S.;Kudo K.;Nohara M.

70(2) 2015/09-2015/09

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16pDA-9 Fermi surfaces and orbital polarization of CeO_<0.5>F_<0.5>BiS_2 revealed by angle-resolved photoemission spectroscopy

Sugimoto T.;Ootsuki D.;Morice C.;Artacho E.;Saxena S. S.;Schwier E. F.;Zheng M.;Kojima Y.;Iwasawa H.;Shimada K.;Arita M.;Namatame H.;Taniguchi M.;Takahashi M.;Saini N. L.;Asano T.;Higashinaka R.;Matsuda T. D.;Aoki Y.;Mizokawa T.

70(2) 2015/09-2015/09

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ISSN:2189079X

Electronic structure of Li1+x[Mn0.5Ni0.5]1-xO2 studied by photoemission and x-ray absorption spectroscopy

Yokoyama, Y.; Yokoyama, Y.; Ootsuki, D.; Sugimoto, T.; Wadati, H.; Okabayashi, J.; Yang, Xu; Du, Fei; Chen, Gang; Mizokawa, T.

Applied Physics Letters 107(3) 2015/07-2015/07

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ISSN:00036951

Outline:© 2015 AIP Publishing LLC. We have studied the electronic structure of Li1+x[Mn0.5Ni0.5]1-xO2 (x = 0.00 and 0.05), one of the promising cathode materials for Li ion battery, by means of x-ray photoemission and absorption spectroscopy. The results show that the valences of Mn and Ni are basically 4+ and 2+, respectively. However, the Mn3+ component in the x = 0.00 sample gradually increases with the bulk sensitivity of the experiment, indicating that the Jahn-Teller active Mn3+ ions are introduced in the bulk due to the site exchange between Li and Ni. The Mn3+ component gets negligibly small in the x = 0.05 sample, which indicates that the excess Li suppresses the site exchange and removes the Jahn-Teller active Mn3+.

Fermi surfaces and orbital polarization in superconducting CeO0.5 F0.5BiS2 revealed by angle-resolved photoemission spectroscopy

Sugimoto, T.; Ootsuki, D.; Morice, C.; Artacho, E.; Artacho, E.; Artacho, E.; Saxena, S. S.; Schwier, E. F.; Zheng, M.; Kojima, Y.; Iwasawa, H.; Shimada, K.; Arita, M.; Namatame, H.; Taniguchi, M.; Taniguchi, M.; Takahashi, M.; Saini, N. L.; Asano, T.; Higashinaka, R.; Matsuda, T. D.; Aoki, Y.; Mizokawa, T.

Physical Review B - Condensed Matter and Materials Physics 92(4) 2015/07-2015/07

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ISSN:10980121

Outline:© 2015 American Physical Society. We have investigated the electronic structure of BiS2-based CeO0.5F0.5BiS2 superconductor using polarization-dependent angle-resolved photoemission spectroscopy (ARPES), and succeeded in elucidating the orbital characters on the Fermi surfaces. In the rectangular Fermi pockets around the X point, the straight portion parallel to the ky direction is dominated by Bi 6px character. The orbital polarization indicates the underlying quasi-one-dimensional electronic structure of the BiS2 system. Moreover, distortions on tetragonally aligned Bi could give rise to the band Jahn-Teller effect.

The effect of RE substitution in layered REO0.5F0.5BiS2: Chemical pressure, local disorder and superconductivity

Mizuguchi, Y.; Mizuguchi, Y.; Paris, E.; Paris, E.; Sugimoto, T.; Iadecola, A.; Kajitani, J.; Miura, O.; Mizokawa, T.; Saini, N. L.

Physical Chemistry Chemical Physics 17(34) p.22090 - 220962015/07-2015/07

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ISSN:14639076

Outline:© the Owner Societies 2015. We have studied the effect of RE substitution on the structure and the local atomic disorder in REO0.5F0.5BiS2 (RE = rare-earth) to understand their correlation with the bulk superconductivity in these materials. The mean RE size, affecting the chemical pressure, has been varied in two series namely Ce1-xNdxO0.5F0.5BiS2 and Nd1-ySmyO0.5F0.5BiS2. The lattice parameters evolve anomalously, showing an anisotropic shrinkage (elongation) of the c-axis (a-axis) to an isotropic expansion of the lattice with increasing mean RE size. The Bi L3-edge extended X-ray absorption fine structure (EXAFS) measurements are performed to investigate local displacements in the BiS2 lattice, revealing a large disorder and a sharp boundary between the Ce-containing and Sm-containing series with a distinct local structure. The results suggest that the bulk superconductivity in REO0.5F0.5BiS2 is correlated with anomalous atomic displacements in the Bi-S1 network, likely to be a combined effect of active Bi 6s electronic states and a possible Jahn-Teller-like instability of the Bi 6px/6py electrons.

Research Grants & Projects

Grant-in-aids for Scientific Research Adoption Situation

Research Classification:

Spectroscopic study on unusual spin-charge-orbital states at surfaces of transition-metal compounds

2013/-0-2016/-0

Allocation Class:¥4290000

Research Classification:

Bayesian theory for spectral deconvolution and its expansion

2012/-0-2014/-0

Allocation Class:¥3510000

Research Classification:

Photoemission study of photo-induced phase transitions at surfaces of strongly correlated electron systems

Allocation Class:¥18980000

Research Classification:

Electronic Structure of Correlated Transition-Metal Oxides under Epitaxial Strain Control of Single Crystal Thin Films

Allocation Class:¥49270000

Research Classification:

Photoemission studies of magnetic semiconductors

Allocation Class:¥19500000

Research Classification:

Development of high energy-resolution inverse photoemission spectroscopy

Allocation Class:¥15500000

Research Classification:

Optical control of electron-hole correlation in excitonic insulators

2019/-0-2023/-0

Allocation Class:¥45240000

Research Classification:

Fluctuation of the orbital/charge degree of freedom and novel physical properties in strongly correlated electron systems

2019/-0-2022/-0

Allocation Class:¥17290000

On-campus Research System

Special Research Project

電荷・軌道不安定を持つ遷移金属カルコゲナイドの電子構造

2015

Research Results Outline:層状構造を持つ磁性体である鉄カルコゲナイドFeTe、ビスマスカルコゲナイドCe(O,F)BiS2超伝導体、励起子絶縁体の候補物質として注目されているT層状構造を持つ磁性体である鉄カルコゲナイドFeTe、ビスマスカルコゲナイドCe(O,F)BiS2超伝導体、励起子絶縁体の候補物質として注目されているTa2Ni(Se.S)5、最高性能を持つ熱電材料として注目されているSnSeについて、超高真空中で単...層状構造を持つ磁性体である鉄カルコゲナイドFeTe、ビスマスカルコゲナイドCe(O,F)BiS2超伝導体、励起子絶縁体の候補物質として注目されているTa2Ni(Se.S)5、最高性能を持つ熱電材料として注目されているSnSeについて、超高真空中で単結晶を剥離した表面を角度分解光電子分光によって計測した。それぞれの物質についてバンド分散やフェルミ面を精密に計測し、電子物性の起源の解明のために重要な役割を果たす知見が得られた。FeTeについては、反強磁性相で電子状態が不均一となり実空間で特徴的な縞状構造が出現することを発見した。

Lecture Course

Course TitleSchoolYearTerm
Science and Engineering Laboratory 1ASchool of Fundamental Science and Engineering2020spring semester
Science and Engineering Laboratory 1A VSchool of Fundamental Science and Engineering2020spring semester
Science and Engineering Laboratory 1ASchool of Creative Science and Engineering2020spring semester
Science and Engineering Laboratory 1A VSchool of Creative Science and Engineering2020spring semester
Science and Engineering Laboratory 1ASchool of Advanced Science and Engineering2020spring semester
Science and Engineering Laboratory 1A VSchool of Advanced Science and Engineering2020spring semester
Science and Engineering LaboratorySchool of Fundamental Science and Engineering2020fall semester
Science and Engineering Laboratory 1BSchool of Fundamental Science and Engineering2020fall semester
Science and Engineering Laboratory 1B VSchool of Fundamental Science and Engineering2020fall semester
Science and Engineering LaboratorySchool of Creative Science and Engineering2020fall semester
Science and Engineering Laboratory 1BSchool of Creative Science and Engineering2020fall semester
Science and Engineering Laboratory 1B VSchool of Creative Science and Engineering2020fall semester
Science and Engineering LaboratorySchool of Advanced Science and Engineering2020fall semester
Science and Engineering Laboratory 1BSchool of Advanced Science and Engineering2020fall semester
Science and Engineering Laboratory 1B VSchool of Advanced Science and Engineering2020fall semester
Fundamental Electromagnetism OukaSchool of Advanced Science and Engineering2020fall semester
Introduction to PhysicsSchool of Advanced Science and Engineering2020spring semester
Introduction to PhysicsSchool of Advanced Science and Engineering2020spring semester
Introduction to Physics [S Grade]School of Advanced Science and Engineering2020spring semester
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Applied Physics: Experiment BSchool of Advanced Science and Engineering2020full year
Physics: Experiment BSchool of Advanced Science and Engineering2020full year
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Physics: Experiment B [S Grade]School of Advanced Science and Engineering2020full year
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Elementary Solid State Physics A [S Grade]School of Advanced Science and Engineering2020spring semester
Elementary Solid State Physics A [S Grade]School of Advanced Science and Engineering2020spring semester
Graduation StudySchool of Advanced Science and Engineering2020full year
Graduation Study [S Grade]School of Advanced Science and Engineering2020full year
Applied Physics Laboratory ASchool of Advanced Science and Engineering2020full year
Applied Physics Laboratory A [S Grade]School of Advanced Science and Engineering2020full year
Graduation Thesis A (Physics)School of Advanced Science and Engineering2020fall semester
Graduation Thesis A (Physics) [S Grade]School of Advanced Science and Engineering2020fall semester
Graduation Thesis A (Applied Physics)School of Advanced Science and Engineering2020fall semester
Graduation Thesis A (Applied Physics) [S Grade]School of Advanced Science and Engineering2020fall semester
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Laboratory for Advanced Science and Engineering ASchool of Advanced Science and Engineering2020spring quarter
Laboratory for Advanced Science and Engineering ASchool of Advanced Science and Engineering2020spring quarter
Laboratory for Advanced Science and Engineering ASchool of Advanced Science and Engineering2020spring quarter
Laboratory for Advanced Science and Engineering A [S Grade]School of Advanced Science and Engineering2020spring quarter
Laboratory for Advanced Science and Engineering A [S Grade]School of Advanced Science and Engineering2020spring quarter
Laboratory for Advanced Science and Engineering A [S Grade]School of Advanced Science and Engineering2020spring quarter
Laboratory for Advanced Science and Engineering BSchool of Advanced Science and Engineering2020summer quarter
Laboratory for Advanced Science and Engineering BSchool of Advanced Science and Engineering2020summer quarter
Laboratory for Advanced Science and Engineering BSchool of Advanced Science and Engineering2020summer quarter
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Current Topics in PhysicsSchool of Advanced Science and Engineering2020fall semester
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Problem Solving in Fundamental Physics ASchool of Advanced Science and Engineering2020spring quarter
Exercises for Fundamental Physics ASchool of Advanced Science and Engineering2020spring quarter
Master's Thesis (Department of Pure and Applied Physics)Graduate School of Advanced Science and Engineering2020full year
Research on Electronic Correlation PhysicsGraduate School of Advanced Science and Engineering2020full year
Research on Electronic Correlation PhysicsGraduate School of Advanced Science and Engineering2020full year
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