Superconductivity at 25 K in hole doped $(L{a}_{1-x}S{r}_x)OFeAs$

Abstract

By partially substituting the tri-valence element La with di-valence element Sr in $LaOFeAs$, we introduced holes into the system. For the first time, we successfully synthesized the hole doped new superconductors $(L{a}_{1-x}S{r}_x)OFeAs$. The maximum superconducting transition temperature at about 25 K was observed at a doping level of x = 0.13. It is evidenced by Hall effect measurements that the conduction in this type of material is dominated by hole-like charge carriers, rather than electron-like ones. Together with the data of the electron doped system $La(O_{1-x}{F}_x)FeAs$, a generic phase diagram is depicted and is revealed to be similar to that of the cuprate superconductors.

5 pages, 5 figures

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