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Observation of strong electron pairing on bands without Fermi surfaces in LiFe(1-x)CoxAs.

Abstract：

:In conventional BCS superconductors, the quantum condensation of superconducting electron pairs is understood as a Fermi surface instability, in which the low-energy electrons are paired by attractive interactions. Whether this explanation is still valid in high-Tc superconductors such as cuprates and iron-based superconductors remains an open question. In particular, a fundamentally different picture of the electron pairs, which are believed to be formed locally by repulsive interactions, may prevail. Here we report a high-resolution angle-resolved photoemission spectroscopy study on LiFe(1-x)CoxAs. We reveal a large and robust superconducting gap on a band sinking below the Fermi level on Co substitution. The observed Fermi-surface-free superconducting order is also the largest over the momentum space, which rules out a proximity effect origin and indicates that the order parameter is not tied to the Fermi surface as a result of a surface instability.

journal_name

Nat Commun

journal_title

Nature communications

authors

Miao H,Qian T,Shi X,Richard P,Kim TK,Hoesch M,Xing LY,Wang XC,Jin CQ,Hu JP,Ding H

doi

10.1038/ncomms7056

subject

Has Abstract

pub_date

2015-01-13 00:00:00

pages

6056

issn

2041-1723

pii

ncomms7056

journal_volume

6

pub_type

杂志文章

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