Upper critical field and quantum oscillations in tetragonal superconducting FeS

Abstract

The magnetoresistance and magnetic torque of FeS are measured in magnetic fields $B$ of up to 18 T down to a temperature of 0.03 K. The superconducting transition temperature is found to be $T_c$ = 4.1 K, and the anisotropy ratio of the upper critical field $B_{c2}$ at $T_c$ is estimated from the initial slopes to be $\Gamma (T_c)$ = 6.9. $B_{c2}(0)$ is estimated to be 2.2 and 0.36 T for $B\parallel ab$ and $c$, respectively. Quantum oscillations are observed in both the resistance and torque. Two frequencies $F$ = 0.15 and 0.20 kT are resolved and assigned to a quasi-two-dimensional Fermi surface cylinder. The carrier density and Sommerfeld coefficient associated with this cylinder are estimated to be 5.8 $\times$ 10${}^{-3}$ carriers/Fe and 0.48 mJ/(K${}^2$mol), respectively. Other Fermi surface pockets still remain to be found. Band-structure calculations are performed and compared to the experimental results.

arXiv comment6 pages, 5 figures

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• Evolution of the Fermi surface of the nematic superconductors FeSe1-xSx
• Suppression of electronic correlations by chemical pressure from FeSe to FeS
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Two-dome superconductivity in FeS induced by a Lifshitz transition
• Electronic structure of FeS
• Spin excitations and the Fermi surface of superconducting FeS
• Thermoelectricity and electronic correlations enhancement in FeS by slight Se substitution
• Unveiling the quasiparticle behaviour in the pressure-induced high-$T_c$ phase of an iron-chalcogenide superconductor
• Accurate determination of the Fermi surface of tetragonal FeS via quantum oscillation measurements and quasiparticle self-consistent \textit{GW} calculations