Observation of Fermi-surface – dependent nodeless superconducting gaps in Ba 0 . 6 K 0 . 4 Fe 2 As 2

@inproceedings{Ding2008ObservationOF,
  title={Observation of Fermi-surface – dependent nodeless superconducting gaps in Ba 0 . 6 K 0 . 4 Fe 2 As 2},
  author={Hong Q. Ding and Pierre Richard and Kazuya Nakayama and Kento Sugawara and Tatsuhiro Arakane and Yoichi Sekiba and Akari Takayama and Seigo Souma and Tomohiro Sato and Tadayuki Takahashi and Zhigang Wang and Xi Dai and Zhong Fang and G. F. Chen and J. L. Luo and N. L. Wang},
  year={2008}
}
We have performed a high-resolution angle-resolved photoelectron spectroscopy study on the newly discovered superconductor Ba0.6K0.4Fe2As2 (Tc = 37K). We have observed two superconducting gaps with different values: a large gap (∆∼ 12meV) on the two small holelike and electron-like Fermi surface (FS) sheets, and a small gap (∼ 6meV) on the large hole-like FS. Both gaps, closing simultaneously at the bulk transition temperature (Tc), are nodeless and nearly isotropic around their respective FS… CONTINUE READING
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