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篇目详细内容 |
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【篇名】 |
Band structure, Fermi surface, and superconducting gap in FeAs-based superconductors revealed by angle-resolved photoemission spectroscopy |
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【刊名】 |
Frontiers of Physics in China |
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【刊名缩写】 |
Front. Phys. China |
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【ISSN】 |
1673-3487 |
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【EISSN】 |
1673-3606 |
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【DOI】 |
10.1007/s11467-009-0058-y |
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【出版社】 |
Higher Education Press and Springer-Verlag |
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【出版年】 |
2009 |
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【卷期】 |
4
卷4期 |
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【页码】 |
427-432
页,共
6
页 |
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【作者】 |
Xing-jiang ZHOU (周兴江);
Guo-dong
LIU (刘国东);
Hai-yun
LIU (刘海云);
Lin
ZHAO (赵林);
Wen-tao
ZHANG (张文涛);
Xiao-wen
JIA (贾小文);
Jian-qiao
MENG (孟建桥);
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【关键词】 |
superconductor; photoemission; electronic structure; Fermi surface; superconducting gap |
【摘要】 |
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In this paper, we present a brief review on our angle-resolved photoemission measurements on the band structure, Fermi surface, and superconducting gap of the newly-discovered FeAs-based high temperature superconductors. (1) The Fermi surface of the FeAs-based compounds are characterized by the hole-like Fermi surface sheets near Γ (0, 0) and the existence of singular Fermi spots near M(π, π). However, the origin of the Fermi spots in the magnetically-ordered state of the parent compound BaFe2As2 and optimally-doped (Ba0.6K0.4)Fe2As2 superconductor may be different. (2) The magnetically-ordered state in the parent compound, BaFe2As2, shows unusual electronic signatures that are distinct from the conventional spin-density-wave system. (3) Multiple nodeless superconducting gap has been observed in (Ba0.6K0.4)Fe2As2 superconductor which is consistent with s-wave superconducting order parameter. |
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