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

Abstract：

: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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Liu D,Zhang W,Mou D,He J,Ou YB,Wang QY,Li Z,Wang L,Zhao L,He S,Peng Y,Liu X,Chen C,Yu L,Liu G,Dong X,Zhang J,Chen C,Xu Z,Hu J,Chen X,Ma X,Xue Q,Zhou XJ

doi

10.1038/ncomms1946

subject

Has Abstract

pub_date

2012-07-03 00:00:00

pages

931

issn

2041-1723

pii

ncomms1946

journal_volume

3

pub_type

杂志文章

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