Physics – Condensed Matter – Superconductivity
Scientific paper
2009-06-29
J. Phys. Soc. Jpn. Vol. 78 (2009) 113701
Physics
Condensed Matter
Superconductivity
8 pages, 3 figures
Scientific paper
10.1143/JPSJ.78.113701
We have performed electrical resistivity measurements of a polycrystalline sample of FeSe$_{0.25}$Te$_{0.75}$, which exhibits superconductivity at $T_{\rm c} \sim 14$ K, in magnetic fields up to 55 T to determine the upper critical field $\mu_{0}H_{\rm c2}$. In this compound, very large slopes of $\mu_{0}H_{\rm c2}$ 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 $\mu_{0}H_{\rm c2}(T)$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.
Hagiwara Masayuki
Kida Takanori
Kindo Koichi
Matsunaga Takahiro
Mizuguchi Yoshikazu
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