Electronic origin of high-temperature superconductivity in single-layer FeSe superconductor

The recent discovery of high-temperature superconductivity in iron-based compounds has attracted much attention. How to further increase the superconducting transition temperature ( T c ) and how to understand the superconductivity mechanism are two prominent issues facing the current study of iron-...

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Published in:Nature communications Vol. 3; no. 1; p. 931
Main Authors: Liu, Defa, Zhang, Wenhao, Mou, Daixiang, He, Junfeng, Ou, Yun-Bo, Wang, Qing-Yan, Li, Zhi, Wang, Lili, Zhao, Lin, He, Shaolong, Peng, Yingying, Liu, Xu, Chen, Chaoyu, Yu, Li, Liu, Guodong, Dong, Xiaoli, Zhang, Jun, Chen, Chuangtian, Xu, Zuyan, Hu, Jiangping, Chen, Xi, Ma, Xucun, Xue, Qikun, Zhou, X.J.
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 03.07.2012
Nature Publishing Group
Subjects:
639/301
639/766/36/1122
Electric Conductivity
High temperature
Hot Temperature
Humanities and Social Sciences
Iron
Iron Compounds - chemistry
multidisciplinary
Science
Science (multidisciplinary)
Selenium - chemistry
Transition temperatures
ISSN:2041-1723, 2041-1723
Online Access:Get full text
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Summary:The recent discovery of high-temperature superconductivity in iron-based compounds has attracted much attention. How to further increase the superconducting transition temperature ( T c ) and how to understand the superconductivity mechanism are two prominent issues facing the current study of iron-based superconductors. The latest report of high- T c superconductivity in a single-layer FeSe is therefore both surprising and significant. Here we present investigations of the electronic structure and superconducting gap of the single-layer FeSe superconductor. Its Fermi surface is distinct from other iron-based superconductors, consisting only of electron-like pockets near the zone corner without indication of any Fermi surface around the zone centre. Nearly isotropic superconducting gap is observed in this strictly two-dimensional system. The temperature dependence of the superconducting gap gives a transition temperature T c ~ 55 K. These results have established a clear case that such a simple electronic structure is compatible with high- T c superconductivity in iron-based superconductors. The exact mechanism for superconductivity in iron-based superconductors remains elusive, but is thought to involve complex interactions between many orbitals. Using angle-resolved photoelectron spectroscopy, Liu et al . report the electronic structure of the single-layer parent compound FeSe.
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ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms1946