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 Communjournal_title
Nature communicationsauthors
Zeng B,Mu G,Luo HQ,Xiang T,Mazin II,Yang H,Shan L,Ren C,Dai PC,Wen HHdoi
10.1038/ncomms1115subject
Has Abstractpub_date
2010-11-16 00:00:00pages
112issn
2041-1723pii
ncomms1115journal_volume
1pub_type
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