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Published Online: 15 October 2008
Accepted: September 2008

Superconductivity at 27K in tetragonal FeSe under high pressure

Appl. Phys. Lett. 93, 152505 (2008); https://doi.org/10.1063/1.3000616
Yoshikazu Mizuguchi1,2, a), Fumiaki Tomioka1, Shunsuke Tsuda1,3, Takahide Yamaguchi1, and Yoshihiko Takano1,2
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ABSTRACT
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 27K at 1.48GPa and the pressure coefficient showed an extremely high value of 9.1K∕GPa. The upper critical field Hc2 was estimated to be ∼72T at 1.48GPa. Because of the high Hc2, the FeSe system can be applied to superconducting wire rods.
The authors would like to thank M. Nagao (University of Yamanashi), A. Kikkawa, H. Suzuki, and H. Kitazawa (NIMS) for useful discussions and experimental helps. This work was partly supported by Grant-in-Aid for scientific Research (KAKENHI).

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