Author:
Yang Yuanyuan,Wang Qisi,Duan Shaofeng,Wo Hongliang,Huang Chaozhi,Wang Shichong,Gu Lingxiao,Qian Dong,Zhao Jun,Zhang Wentao
Abstract
High-resolution angle-resolved photoemission measurements were taken on FeSe1–x
S
x
(x = 0, 0.04, and 0.08) superconductors. With an ultrahigh energy resolution of 0.4 meV, unusual two hole bands near the Brillouin-zone center, which was possibly a result of additional symmetry breaking, were identified in all the sulfur-substituted samples. In addition, in both of the hole bands highly anisotropic superconducting gaps with resolution limited nodes were evidenced. We find that the larger superconducting gap on the outer hole band is reduced linearly to the nematic transition temperature while the gap on the inner hole is nearly S-substitution independent. Our observations strongly suggest that the superconducting gap increases with enhanced nematicity although the superconducting transition temperature is not only governed by the pairing strength, demonstrating strong constraints on theories in the FeSe family.
Subject
General Physics and Astronomy
Cited by
3 articles.
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