Anisotropic structure of the order parameter in FeSe(0.45)Te(0.55) revealed by angle-resolved specific heat.

Abstract:

:The central issues for understanding iron (Fe)-based superconductors are the symmetry and structure of the superconducting gap. So far the experimental data and theoretical models have been highly controversial. Some experiments favor two or more constant or nearly constant gaps, others indicate strong anisotropy and yet others suggest gap zeros ('nodes'). A unique method for addressing this issue, and one of very few methods that are bulk and angle resolved, is measuring the electronic-specific heat in a rotating magnetic field. In this study, we present the first such measurement for an Fe-based high-T(c) superconductor. We observed a fourfold oscillation of the specific heat as a function of the in-plane magnetic field direction. Our results are consistent with the expectations for an extended s-wave model, with a significant gap anisotropy on the electron pockets and the gap minima along the ΓM (Fe-Fe bond) direction.

journal_name

Nat Commun

journal_title

Nature communications

authors

Zeng B,Mu G,Luo HQ,Xiang T,Mazin II,Yang H,Shan L,Ren C,Dai PC,Wen HH

doi

10.1038/ncomms1115

subject

Has Abstract

pub_date

2010-11-16 00:00:00

pages

112

issn

2041-1723

pii

ncomms1115

journal_volume

1

pub_type

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