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Coexistence of low-moment magnetism and superconductivity in tetragonal FeS and suppression of T-c under pressure

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Holenstein S., Pachmayr U., Guguchia Z., Kamusella S., Khasanov R., Amato A., Baines C., Klauss H-H, Morenzoni E., Johrendt D., Luetkens H.,
Project Interplay between the superconductivity and magnetism in cuprate and Fe-based superconductors
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Original article (peer-reviewed)

Volume (Issue) 93(14)
Page(s) 140506
Title of proceedings PHYSICAL REVIEW B
DOI 10.1103/physrevb.93.140506


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 B) disordered magnetism with a transition temperature of T-N approximate to 20 K microscopically coexists with bulk superconductivity below T-c = 4.3(1) K. From transverse field mu SR we obtain an in-plane penetration depth lambda(ab)(0) = 223(2) nm for FeS. The temperature dependence of the corresponding superfluid density lambda(-2)(ab)(T) indicates a fully gapped superconducting state and is consistent with a two gap s-wave model. Additionally, we find that the superconducting T-c of FeS continuously decreases for hydrostatic pressures up to 2.2 GPa.