Coexistence of low moment magnetism and superconductivity in tetragonal FeS and suppression of $T_{\mathrm{c}}$ under pressure

Abstract

We report local probe ($\mu$SR) measurements on the recently discovered tetragonal FeS superconductor which has been predicted to be electronically very similar to superconducting FeSe. Most remarkably, we find that low moment ($10^{-2}-10^{-3}{\mu }_{\mathrm{B}})$ disordered magnetism with a transition temperature of $T_{\mathrm{N}}\approx 20$ K microscopically coexists with bulk superconductivity below $T_{\mathrm{c}}=4.3(1)$ K. From transverse field $\mu$SR we obtain an in-plane penetration depth ${\lambda }_{\mathrm{ab}}(0)=223(2)$ nm for FeS. The temperature dependence of the corresponding superfluid density ${\lambda }_{\mathrm{ab}}^{-2}(T)$ indicates a fully gapped superconducting state and is consistent with a two gap s-wave model. Additionally, we find that the superconducting $T_{\mathrm{c}}$ of FeS continuously decreases for hydrostatic pressures up to 2.2 GPa.

10 pages, 7 figures, including supplemental material

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• FeS: Structure and Composition Relations to Superconductivity and Magnetism
• Phonon anomalies in FeS
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• Critical current density and vortex pinning in tetragonal FeS${}_{1-x}$Se${}_x$ ($x=0,0.06$)
• Electronic structure of FeS
• Robustness of superconductivity to competing magnetic phases in tetragonal FeS
• Spin excitations and the Fermi surface of superconducting FeS
• Upper critical field and quantum oscillations in tetragonal superconducting FeS
• Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSe${}_{1\text{-}\mathrm{x}}$S${}_{\mathrm{x}}$
• Topological crystalline antiferromagnetic state in tetragonal FeS
• Plaquette instability competing with bicollinear ground state in detwinned FeTe
• Nodal superconductivity coexists with low-moment static magnetism in single-crystalline tetragonal FeS: A muon spin relaxation and rotation study
• Suppression of Superconductivity and Nematic Order in Fe${}_{1-y}$Se${}_{1-x}$S${}_x$ (0$\le$$x$$\le$1, $y$$\le$0.1) Crystals by Anion Height Disorder
• Evolution of lattice, spin, and charge properties across the phase diagram of FeSe${}_{1-x}$S${}_x$
• Thermoelectricity and electronic correlations enhancement in FeS by slight Se substitution
• Observation of a C-type short range antiferromagnetic order in expanded FeS
• Accurate determination of the Fermi surface of tetragonal FeS via quantum oscillation measurements and quasiparticle self-consistent \textit{GW} calculations
• Stabilization and heteroepitaxial growth of metastable tetragonal FeS thin films by pulsed laser deposition
• Observation of two distinct superconducting domes under pressure in tetragonal FeS
• Identifying materials with charge-spin physics using charge-spin susceptibility computed from first principles
• Pressure-induced magnetism in iron-based superconductors $A$Fe${}_2$As${}_2$ ($A=$ K, Cs, Rb)