Anomalous Pressure Dependence of the Superconducting Transition Temperature in FeSe1-x Studied by DC Magnetic Measurements
Miyoshi, K. · Takaichi, Y. · Mutou, E. · Fujiwara, K. · Takeuchi, J.
Original · EN
The pressure dependence of superconducting transition temperature T c has been investigated through the DC magnetic measurements for FeSe₀.₈ and FeSe₁.₀. For both samples, with increasing pressure P, the T c-P curve exhibits a two-step increase, showing a local maximum of 11 K at P 1.0 GPa and a rapid increase with an extremely large pressure coefficient for P>1.5 GPa. T c saturates at 25 K (21 K) in FeSe₁.₀ (FeSe₀.₈) for P>3 GPa. A rapid decrease in superconducting volume fraction is observed with an increase in T c above 1.5 GPa, suggesting the presence of electronic inhomogeneity.
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