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Nodal superconductivity in FeS: Evidence from quasiparticle heat transport

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arxiv 1511.07717 v3 pith:4DXTCWCB submitted 2015-11-24 cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

T. P. Ying , X. F. Lai , X. C. Hong , Y. Xu , L. P. He , J. Zhang , M. X. Wang , Y. J. Yu
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F. Q. Huang S. Y. Li
This is my paper · ORCID
classification cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
keywords fieldnodalsuperconductingevidencefeseheatironkappa
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abstract

We report low-temperature heat transport measurements on superconducting iron sulfide FeS with $T_c \approx$ 5 K, which has the same crystal structure and similar electronic band structure to the superconducting iron selenide FeSe. In zero magnetic field, a significant residual linear term $\kappa_0/T$ is observed. At low field, $\kappa_0/T$ increases rapidly with the increase of field. These results provide strong evidence for nodal superconducting gap in FeS. We compare it with the sister compound FeSe, and other iron-based superconductors with nodal gap.

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