Anomalous Pressure Dependence of the Superconducting Transition Temperature in FeSe1-x Studied by DC Magnetic Measurements

Abstract

The pressure dependence of superconducting transition temperature $T_{\mathrm{c}}$ has been investigated through the DC magnetic measurements for FeSe${}_{0.8}$ and FeSe${}_{1.0}$. For both samples, with increasing pressure $P$, the $T_{\mathrm{c}}$$-$$P$ curve exhibits a two-step increase, showing a local maximum of $\sim$11 K at $P$$\sim$1.0 GPa and a rapid increase with an extremely large pressure coefficient for $P$$>$1.5 GPa. $T_{\mathrm{c}}$ saturates at $\sim$25 K (21 K) in FeSe${}_{1.0}$ (FeSe${}_{0.8}$) for $P$$>$3 GPa. A rapid decrease in superconducting volume fraction is observed with an increase in $T_{\mathrm{c}}$ above 1.5 GPa, suggesting the presence of electronic inhomogeneity.

4 pages, 4 figures, to appear in J. Phys. Soc. Jpn, 78 (2009), No. 9

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