Observation of two-level critical state in the superconducting FeTe thin films

Abstract

FeTe, a non-superconducting parent compound in the iron-chalcogenide family, becomes superconducting after annealing in oxygen. Under the presence of magnetism, spin-orbit coupling, inhomogeneity and lattice distortion, the nature of its superconductivity is not well understood. Here, we combined mutual inductance technique with magneto transport to study the magnetization and superconductivity of FeTe thin films. We found that the films with the highest Tc showed non-saturating superfluid density and a strong magnetic hysteresis distinct from that in a homogeneous superconductor. Such hysteresis can be well explained by a two-level critical state model and suggested the importance of granularity to superconductivity in this compound.

References in corpus (10)

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Cited by in corpus (6)

• Direct observation of quantum anomalous vortex in Fe(Se,Te)
• Oxygen adsorption induced superconductivity in ultrathin FeTe film on SrTiO3(001)
• Magnetoresistance hysteresis in the superconduting state of Kagome CsV${}_3$Sb${}_5$
• Current-induced magnetoresistance hysteresis in the kagome superconductor CsV${}_3$Sb${}_5$
• Observation of two-level critical-state in a van-der-Waals superconductor Pt(Bi${}_{1-x}$Se${}_x$)${}_2$
• Suppression and revival of superconducting phase coherence in monolayer FeSe/SrTiO${}_3$