2012 Fiscal Year Final Research Report
Bulk electronic states of high-Tc cuprate superconductors studied by high-resolution angle-resolved photoemission spectroscopy
| Project/Area Number |
21340088
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tohoku University |
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Principal Investigator |
SATO Takafumi 東北大学, 大学院・理学研究科, 准教授 (10361065)
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| Project Period (FY) |
2009 – 2012
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| Keywords | 光電子分光 / 超伝導 / 銅酸化物 |
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| Research Abstract |
We have constructed low-energy ultrahigh-resolution photoemission spectrometer to elucidate the bulk electronic states in the vicinity of the Fermi level in high-temperature cuprate superconductors, and have performed high-resolution angle-resolved photoemission spectroscopy (ARPES) studies of cuprates and related materials. We have found an existence of two different types of pseudogaps above superconducting transition temperature in single- and multi-layered Bi-based cuprates by the systematic temperature- and momentum-dependent ARPES measurements. In addition, we have clarified the electronic states of related materials, such as cobalt oxides and iron-based superconductors, and revealed characteristic similarities/dissimilarities among these superconductors, which are a key to the deeper understanding of the mechanism of high-temperature superconductivity.
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[Journal Article] Unconventional anisotropic s-wave superconducting gap of LiFeAs iron-pnictide superconductor2012
Author(s)
K. Umezawa, Y. Li, H. Miao, K. Nakayama, Z.-H. Liu, P. Richard, T. Sato, J. B. He, D.-M. Wang, G. F. Chen, H. Ding, T. Takahashi, and S.-C. Wang
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Journal Title
Phys. Rev. Lett
Volume: vol. 108
Pages: 037002-1-5
DOI
Peer Reviewed
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[Journal Article] Two Pseudogaps with Different Energy Scales at the Antinode of the High-Temperature Bi2Sr2CuO6Superconductor Using Angle-Resolved Photoemission Spectroscopy2011
Author(s)
K. Nakayama, T. Sato, Y.-M. Xu, Z.-H.Pan, P. Richard, H. Ding, H.-H. Wen, K. Kudo, T. Sasaki, N. Kobayashi, and T. Takahashi
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Journal Title
Phys. Rev. B
Volume: vol. 83
Pages: 224509-1-5
DOI
Peer Reviewed
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[Journal Article] Fermi surface dichotomy of superconducting gap and pseudogap in underdoped pnictides2011
Author(s)
Y.-M. Xu, P. Richard, K. Nakayama, T.Kawahara, Y. Sekiba, T. Qian, M. Neupane, S. Souma, T. Sato, T. Takahashi, H. Luo, H.-H. Wen, G.-F. Chen, N.-L. Wang, Z. Wang, Z. Fang, X. Dai, and H. Ding
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Journal Title
Nature Commun
Volume: vol. 2, 392
DOI
Peer Reviewed
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