Nodal Superconducting Gap in $\beta$-FeS

Jie Xing; Hai Lin; Yufeng Li; Sheng Li; Xiyu Zhu; Huan Yang; Hai-Hu Wen

doi:10.1103/PhysRevB.93.104520

Nodal Superconducting Gap in $\beta$-FeS

Superconductivity 2016-03-23 v1

Authors: Jie Xing , Hai Lin , Yufeng Li , Sheng Li , Xiyu Zhu , Huan Yang , Hai-Hu Wen

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Abstract

Low temperature specific heat has been measured in superconductor $\beta$ -FeS with T $_c$ = 4.55 K. It is found that the low temperature electronic specific heat C $_e$ /T can be fitted to a linear relation in the low temperature region, but fails to be described by an exponential relation as expected by an s-wave gap. We try fittings to the data with different gap structures and find that a model with one or two nodal gaps can fit the data. Under a magnetic field, the field induced specific heat $\Delta\gamma$ =[C $_e$ (H)-C $_e$ (0)]/T shows the Volovik relation $\Delta\gamma_e(H)\propto \sqrt{H}$ , suggesting the presence of nodal gap(s) in this material.

Keywords

superconductivity thermal properties of materials magnetization

Cite

@article{arxiv.1512.04074,
  title  = {Nodal Superconducting Gap in $\beta$-FeS},
  author = {Jie Xing and Hai Lin and Yufeng Li and Sheng Li and Xiyu Zhu and Huan Yang and Hai-Hu Wen},
  journal= {arXiv preprint arXiv:1512.04074},
  year   = {2016}
}

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6 pages, 5 figures

Nodal Superconducting Gap in $\beta$-FeS

Abstract

Keywords

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