Nodal superconductivity in FeS: Evidence from quasiparticle heat transport

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.

arXiv comment7 pages, 4 figures

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Cited by in corpus (12)

• Nematicity, magnetism and superconductivity in FeSe
• Highly Anisotropic Superconducting Gap in Nematically Ordered and Tetragonal Phases of FeSe${}_{1-x}$S${}_x$
• FeS: Structure and Composition Relations to Superconductivity and Magnetism
• Nodal Superconducting Gap in $\beta$-FeS
• Two-dome superconductivity in FeS induced by a Lifshitz transition
• Electronic structure of FeS
• Robustness of superconductivity to competing magnetic phases in tetragonal FeS
• Basic electronic properties of iron selenide under variation of structural parameters
• Nodal superconductivity coexists with low-moment static magnetism in single-crystalline tetragonal FeS: A muon spin relaxation and rotation study
• Thermoelectricity and electronic correlations enhancement in FeS by slight Se substitution
• Molecular Beam Epitaxy Growth of Tetragonal FeS Film on SrTiO3(001) Substrate
• Accurate determination of the Fermi surface of tetragonal FeS via quantum oscillation measurements and quasiparticle self-consistent \textit{GW} calculations