2012 Fiscal Year Final Research Report
Photoemission study on a quantum critical Yb-based Kondo system
| Project/Area Number |
23840039
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
OKAWA Mario 東京理科大学, 理学部, 助教 (50609302)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 強相関電子系 / 重い電子系 / 価数揺動 / 量子臨界点 / 光電子分光 |
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| Research Abstract |
In a heavy fermion α-YbAlB4, unconventional quantum criticality and antiferromagnetic order can be induced by a few % Al-Fe substitution. To clarify the nature of this quantum criticality in the α-Yb(Al,Fe)B4system, we investigate temperature- and Fe-doping-dependence of the Yb valence, which reflects heavy-electron and magnetic states, in detail using hard x-ray photoemission spectroscopy. As a result, we found the sharp crossover at the quantum critical region in the Fe-doping dependence of the Yb valence and its characteristic temperature of ～100 K.
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Author(s)
T. Yokobori, M. Okawa, K. Konishi, R. Takei, K. Katayama, S. Oozono, T. Shinmura, T. Okuda, H. Wadati, E. Sakai, K. Ono, H. Kumigashira, M. Oshima, T. Sugiyama, E. Ikenaga, N. Hamada, and T. Saitoh
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Journal Title
Physical Review B
Volume: 87
Pages: 195124
DOI
Peer Reviewed
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[Journal Article] Angle-resolved photoemission study on the superconducting iron-pnictides of BaFe_2(As,P)_2 with low energy photons2012
Author(s)
T. Shimojima, F. Sakaguchi, K. Ishizaka, Y. Ishida, W. Malaeb, T. Yoshida, S. Ideta, A. Fujimori, T. Kiss, M. Okawa, T. Togashi, C.-T. Chen, S. Watanabe, Y. Nakashima, A. Ino, H. Anzai, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, S. Kasahara, T. Terashima, T. Shibauchi, Y. Matsuda, M. Nakajima, S. Uchida, K. Kihou, C. H. Lee, A. Iyo, H. Eisaki, A. Chainani, and S. Shin
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Journal Title
Solid State Communications
Volume: 152
Pages: 695
DOI
Peer Reviewed
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[Journal Article] Common origin of the circular-dichroism pattern in angle-resolved photoemission spectroscopy of SrTiO_3 and Cu_xBi_2Se_32011
Author(s)
Y. Ishida, H. Kanto, A. Kikkawa, Y. Taguchi, Y. Ito, Y. Ota, K. Okazaki, W. Malaeb, M. Mulazzi, M. Okawa, S. Watanabe, C.-T. Chen, M. Kim, C. Bell, Y. Kozuka, H. Y. Hwang, Y. Tokura, and S. Shin
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Journal Title
Physical Review Letters
Volume: 107
Pages: 077601
DOI
Peer Reviewed
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[Journal Article] Ultrahigh-resolution laser photoemission study of Uru_2Si_2across the hidden-order transition2011
Author(s)
R. Yoshida, Y. Nakamura, M. Fukui, Y. Haga, E. Yamamoto, Y. Onuki, M. Okawa, S. Shin, M. Hirai, Y. Muraoka, and T, Yokoya
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Journal Title
Journal of physics and chemistry of solids
Volume: 72
Pages: 580
DOI
Peer Reviewed
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[Journal Article] Electronic structure of an antiferromagnetic metal2011
Author(s)
P. A. Bhobe, A. Chainani, M. Taguchi, R. Eguchi, M. Matsunami, T. Ohtsuki, K. Ishizaka, M. Okawa, M. Oura, Y. Senba, H. Ohashi, M. Isobe, Y. Ueda, and S. Shin
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Journal Title
CaCrO_3, Physical Review B
Volume: 83
Pages: 165132
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Peer Reviewed
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[Journal Article] Orbital-independent superconducting gaps in iron pnictides
Author(s)
T. Shimojima, F. Sakaguchi, K. Ishizaka, Y. Ishida, T. Kiss, M. Okawa, T. Togashi, C.-T. Chen, S. Watanabe, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, K. Ohgushi, S. Kasahara, T. Terashima, T. Shibauchi, Y. Matsuda, A. Chainani, and S. Shin
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Journal Title
Science
Volume: 332
Pages: 564
DOI
Peer Reviewed
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