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

Takanori Kida, Takahiro Matsunaga, Masayuki Hagiwara +3

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 magneti…