Abrupt change in the energy gap of superconducting Ba 1-xK xFe 2As 2 single crystals with hole doping

W. Malaeb, T. Shimojima, Y. Ishida, K. Okazaki, Y. Ota, K. Ohgushi, K. Kihou, T. Saito, C. H. Lee, S. Ishida, M. Nakajima, S. Uchida, H. Fukazawa, Y. Kohori, A. Iyo, H. Eisaki, C. T. Chen, S. Watanabe, H. Ikeda, S. Shin

研究成果: Article査読

55 被引用数 (Scopus)

抄録

We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba 1-xK xFe 2As 2 (BaK) and precisely determined the doping evolution of the superconducting gaps in this compound. The gap size of the outer hole Fermi-surface (FS) sheet around the Brillouin zone (BZ) center shows an abrupt drop with overdoping (for x 0.6) while the inner and middle FS gaps roughly scale with T c. This is accompanied by the simultaneous disappearance of the electron FS sheet with similar orbital character at the BZ corner. These results indicate the different contributions of X2-Y2 and XZ/YZ orbitals to superconductivity in BaK and can hardly be completely reproduced by the available theories on iron-based superconductors.

本文言語English
論文番号165117
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
86
16
DOI
出版ステータスPublished - 2012 10月 10
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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