Two distinct superconducting states in KFe2As2 under high pressure

@inproceedings{Terashima2014TwoDS,
  title={Two distinct superconducting states in KFe2As2 under high pressure},
  author={Taichi Terashima and Kunihiro Kihou and Kiyomasa Sugii and Naoki Kikugawa and Takehiko Matsumoto and Shigeyuki Ishida and Chul-Ho Lee and Akira Iyo and Hiroshi Eisaki and Shinya Uji},
  year={2014}
}
We report measurements of ac magnetic susceptibility $\chi_{ac}$ and de Haas-van Alphen (dHvA) oscillations in KFe$_2$As$_2$ under high pressure up to 24.7 kbar. The pressure dependence of the superconducting transition temperature $T_c$ changes from negative to positive across $P_c \sim 18$ kbar as previously reported. The ratio of the upper critical field to $T_c$, i.e, $B_{c2} / T_c$, is enhanced above $P_c$, and the shape of $\chi_{ac}$ vs field curves qualitatively changes across $P_c… CONTINUE READING

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