業績紹介

2021年度

Development of In-Gap State and Related Collapse of Two-Step Energy Gap Structure by Nonmagnetic Ion Substitution in Kondo Insulator YbB12

Wataru Matsuhra, Naoki Takahashi, Kensuke Yamada, Mizuto Kadowaki, and Fumitoshi Iga

Journal of the Physical Society of Japan 90, 124705 (2021)．

Unusual high-field metal in a Kondo insulator

Z. Xiang, L. Chen, K-W. Chen, C. Tinsman, Y. sato, T. Asaba, H. Lu, Y. Kasahara, M. Jaime, F. Barakirev, F. Iga, Y. matsuda, J. Singleton, and L. Li

Nature Physics, 17, 788–793 (2021).

Robust hybridization gap in the Kondo insulator YbB12 probed by femtosecond optical spectroscopy

A. R. Okharel, S.Y. Agustsson, V.V. Kavanov, F. Iga, T. Takabatake, H. Okamura, and J. Demsar

Physical Review B 103, 115134(2021).

Field-induced valence fluctuations in YbB12

R. Kurihara, A. Miyake, M. tokunaga, A. Ikeda, Y.H. Matsuda, A. Miyata, D.Igorbunov, T. Nomura, S. Zherlitsyn, J. Wosnitza, and F. Iga

Physical Review B 103, 115103(2021).

近藤絶縁体の量子振動と中性フェルミオン励起

佐藤雄貴，笠原裕一，伊賀文俊，松田祐司

日本物理学会誌76,2(2021).

2020年度

Behavior of Sm in the boron-cage of Sm-doped RB6 (R=Yb,La) observed by multiple-wavelength neutron holography

S. Uechi, K. Ohoyama, Y. Fukumoto, Y. Kanazawa, N. Happo, M. Harada, Y. Inamura, K. Oikawa, W. Matsuhra, F.Iga, A. K. R. Ang, and K. Hayashi

Physical Review B 102, 054104 (2020).

Point-contact spectroscopy study of Kondo insulator SmB6

T. Harada, M. Shiga, K. Okimura, Y. Inagaki, F. Iga, and T. Kawae

JPS Conf. Proc. 30, 011022 (2020).

Novel dynamical properties in the zero-field antiferroquadrupole ordered state of CeB6

Taichi Tanaka, Hiroki Mori, Keisuke Miyamoto, Yusuke Nakai, Koichi Ueda, Fumitoshi Iga, and Takeshi Mito

JPS Conf. Proc. 30, 011153 (2020).

Physical Properties of Novel Material TmB6 Synthesized by Molecular Beam Epitaxy Method

Tomoyuki Kun1, Fumiya Tanifuji, Daichi Hatanaka, Kôki Takeda, Yoshitomo Harada, Hirotaka Yamaguchi,Takeshi Ikeda, Mitsuteru Nakamura, Yoshiki Nakanishi, Fumitoshi Iga, and Masahito Yoshizawa

JPS Conf. Proc. 30, 011182 (2020).

The Temperature Dependence of the Magnetization Process of the Kondo Insulator YbB12

Yasuhiro H. Matsuda, Yoshiki Kakita and Fumitoshi Iga

Crystals 10, 26 (2020).

トポロジカル近藤絶縁体の表面電子状態―研究の最近の発展―

大坪嘉之，木村真一，伊賀文俊

固体物理 55, 337 (2020).

トポロジカル近藤絶縁体YbB12およびSmB6に関連した高圧合成および高圧下物性

伊賀文俊，松浦航，加賀山朋子，水戸毅

日本高圧力学会「高圧力の科学と技術」30巻 No.4.

2019年度

Unconventional thermal metallic state of charge-neutral fermions in an insulator

Y. Sato, Z. Xiang, Y. Kasahara, T. Taniguchi, S. Kasahara, L. Chen, T. Asaba, C. Tinsman, H. Murayama, O.Tanaka, Y. Mizukami, T. Shibauchi, F. Iga, J. Singleton, Lu Li & Y. Matsuda

Nat. Phys. (2019).

Non-trivial surface states of samarium hexaboride at the (111) surface

Yoshiyuki Ohtsubo, Yuki Yamashita, Kenta Hagiwara, Shin-ichiro Ideta, Kiyohisa Tanaka, Ryu Yukawa, Koji Horiba, Hiroshi Kumigashira, Koji Miyamoto, Taichi Okuda, Wataru Hirano, Fumitoshi Iga & Shin-ichi Kimura

Nat. Commun. 10, 2298 (2019).

Material Development of Kondo Insulator Yb1-xCaxB12 by High-Pressure Synthesis

Wataru MATSUHRA, Keisei YOKOMICHI, Wataru HIRANO, Shoya KIKUCHI, Naoyuki UEMATSU, Hiroyuki NAKAYAMA, Akihiro KONDO, Koichi KINDO, and Fumitoshi IGA

JPS Conf. Proc. 25, 011016 (2019).

Magnetic and Electrical Transport Properties of TmxR1-xB6 (R = Ca and Yb) Produced by Using High-Pressure Synthesis

Fumitoshi IGA, Wataru HIRANO, Wataru MATSUHRA, Hiroyuki NAKAYAMA, Shoya KIKUCHI, Takayuki YAMADA, Akihiro KONDO, Koichi KINDO, Tohru IRIFUNE, and Tohru SHIMMEI

JPS Conf. Proc. 25, 011017 (2019).

2018年度

Non-magnetic element substitution effect in Kondo insulator YbB12 and exotic surface effect in this alloy system

F. Iga, K. Yokomichi, W. Matsuhra, H. Nakayama, A. Kondo, K. Kindo, and H. Yoshizawa

AIP Advances 8, 101335 (2018).

Divalent ion substitution effect on Yb-site in Kondo insulator YbB12

W. Matsuhra, K. Yokomichi, W. Hirano, S. Kikuchi, N. Uematsu, H. Nakayama, A. Kondo, K. Kindo, and F. Iga

AIP Advances 8, 101329 (2018).

Magnetic properties of perovskite Ca1-xSrxFeO3

H. Kawanaka, E. Kawawa, Y. Nishihara, F. Iga, A. Kondo, K. Kindo, and Y. Matsuda

AIP Advances 8, 101418 (2018).

Quantum oscillations of electrical resistivity in an insulator

HZ. Xiang, Y. Kasahara, T. Asaba, B. Lawson, C. Tinsman, Lu Chen, K. Sugimoto, S. Kawaguchi, Y. Sato, G. Li, S. Yao, Y. L. Chen, F. Iga, John Singleton, Y. Matsuda, Lu Li

Science 362, 65 (2018)

Magnetic-Field-Induced Kondo Metal Realized in YbB12

Taku T. Terashima, Yasuhiro H. Matsuda, Yoshimitsu Kohama, Akihiko Ikeda, Akihiro Kondo, Koichi Kindo, Fumitoshi Iga

Phys. Rev. Lett. 120, 257206 (2018).

Magnetic-ordering propagation vectors of Terbium hexaboride revisited

K. Iwasa, F. iga, T. Moyoshi, A. Nakao, T. Ohhara

J. Phys. Soc. Jpn. 87, 064705 (2018).

Kondo-like behavior near the magnetic instability in SmB6: Temperature and pressure dependences of the Sm valence

N. Emi, N. Kawamura, M. Mizumaki, T. Koyama, N. Ishimatsu, G. Pristáš, T. Kagayama, K. Shimizu, Y. Osanai, F.Iga and T. Mito

Phys. Rev. B 97, 161116(R) (2018).

Temperature and pressure dependences of Sm valence in intermediate valence compound SmB6

N. Emi, T. Mito,⁎, N. Kawamura, M. Mizumaki, N. Ishimatsu, G. Pristáš, T. Kagayama, K. Shimizu, Y. Osanai, F.Iga

Physica B 536, 197 (2018).

Surface electronic structure of SmB6(111)

Yoshiyuki Ohtsubo, Kenta Hagiwara, Chengwei Wang, Ryu Yukawa, Koji Horiba, Hiroshi Kumigashira, Wataru Hirano, Fumitoshi Iga, Shin-ichi Kimura

Physica B 536, 75 (2018).

2017年度

Evidence for in-gap surface states on the single-phase SmB6(001) surface

oshio Miyamachi, Shigemasa Suga, Martin Ellguth, Christian Tusche, Claus Schneider, Fumitoshi Iga, and Fumio Komori

Scientific Reports,7,12837(1)-12837(7).

Hard x-ray photoemission study of Yb1−xZrxB12 : the effects of electron doping on the Kondo insulator YbB12

A Rousuli, H Sato, F Iga, K Hayashi, K Ishii, T Wada,T Nagasaki, K Mimura, H Anzai, K Ichiki, SUeda, A Kondo, K Kindo, T Takabatake, K Shimada, H Namatame, M Taniguchi

Journal of Physics: Condensed Matter,29, 265601(1)-265601(7)

Magnetization process of the Kondo Insulator YbB12 in ultrahigh magnetic field

Taku. T. Terashima, Akihiko Ikeda, Tasuhiro H. Matsuda, Akihiro Kondo, Koichi Kindo, Fumitoshi Iga

Journal of the Physical Society of Japan,86, 54710.

Temperature dependence of Yb valence in the sub-surface of YbB12(001)

Kenta Hagiwara, Yusuke Takeno, Yoshiyuki Ohtsubo, Ryu Yukawa, Masaki Kobayashi, Koji Horiba, Hiroshi, Kumigashira, Julien Rault, Patrick Le Fèvre, François Bertran, Amina Taleb-Ibrahimi, Fumitoshi Iga, Shin-ichi Kimura

IOP Conf. Series: Journal of Physics: Conf.Series,807, 12003

Linear dichroism in 3d core-level and 4f valence-band photoemission spectra of strongly correlated rare-earth compounds

Y. Kanai, T. Mori, S. Naimen, K. Yamagami, S. Kitayama, H. Fujiwara,A. Higashiya, T. Kadono, S. Imada, T.Kiss, A. Tanaka, T. Muro, K. Tamasaku,M. Yabashi, T. Ishikawa, F. Iga, T. Ebihara, F. Honda, Y. Onuki, A.Sekiyama

Journal of Electron Spectroscopy and Related Phenomena,220,61-65.

Different valence states of Tm in YB6 and YbB6

H. Satoa, H. Nagatab, F. Igac, Y. Osanaid, A. Rousulib, K. Mimurae, H. Anzaie, K. Ichikie, S. Uedaf, g, T.Takabatakeh, i, A. Kondoj, K. Kindoj, K. Shimadaa, H. Namatamea, M. Taniguchia

Journal of Electron Spectroscopy and Related Phenomena,220,33-36.