Upper critical fields of the 11-system iron-chalcogenide superconductor FeSe${}_{0.25}$Te${}_{0.75}$

Abstract

We have performed electrical resistivity measurements of a polycrystalline sample of FeSe${}_{0.25}$Te${}_{0.75}$, which exhibits superconductivity at $T_{\mathrm{c}}\sim 14$ K, in magnetic fields up to 55 T to determine the upper critical field ${\mu }_0{H}_{c2}$. In this compound, very large slopes of ${\mu }_0{H}_{c2}$ at the onset, the mid-point, the zero-resistivity temperatures on superconductivity are determined to be -13.7, -10.1, and -6.9 T/K, respectively. The observed ${\mu }_0{H}_{c2}(T)$s of this compound are considerably smaller than those expected from the Werthamer-Helfand-Hohenberg model, manifesting the Pauli limiting behavior. These results suggest that this compound has a large Maki parameter, but it is smaller than that calculated for a weak-coupling superconductor, indicating a large superconducting gap of this compound as a strong-coupling superconductor.

8 pages, 3 figures

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