Superconductivity at 27 K in tetragonal FeSe under high pressure

Mizuguchi, Yoshikazu; Tomioka, Fumiaki; Tsuda, Shunsuke; Yamaguchi, Takahide; Takano, Yoshihiko
October 2008
Applied Physics Letters;10/13/2008, Vol. 93 Issue 15, p152505
Academic Journal
A huge enhancement of the superconducting transition temperature Tc was observed in a tetragonal FeSe superconductor under high pressure. The onset temperature was as high as 27 K at 1.48 GPa and the pressure coefficient showed an extremely high value of 9.1 K/GPa. The upper critical field Hc2 was estimated to be ∼72 T at 1.48 GPa. Because of the high Hc2, the FeSe system can be applied to superconducting wire rods.


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