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FeTe, a non-superconducting parent compound in the iron-chalcogenide family,becomes superconducting after annealing in oxygen. Under the presence ofmagnetism, spin-orbit coupling, inhomogeneity and lattice distortion, thenature of its superconductivity is not well understood. Here, we combinedmutual inductance technique with magneto transport to study the magnetizationand superconductivity of FeTe thin films. We found that the films with thehighest Tc showed non-saturating superfluid density and a strong magnetichysteresis distinct from that in a homogeneous superconductor. Such hysteresiscan be well explained by a two-level critical state model and suggested theimportance of granularity to superconductivity in this compound.

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