Doping-dependent and orbital-dependent band renormalization in Ba(Fe 1-xCox)2As2 superconductors

Takaaki Sudayama, Yuki Wakisaka, Takashi Mizokawa, Soshi Ibuka, Rei Morinaga, Taku J. Sato, Masashi Arita, Hirofumi Namatame, Masaki Taniguchi, Naurang L. Saini

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14 Citations (Scopus)


Angle resolved photoemission spectroscopy of Ba(Fe1-xCo x)2As2 (x = 0:06, 0.14, and 0.24) shows that the width of the Fe 3dyz/zx hole band depends on the doping level. In contrast, the Fe 3dx2-y2 and 3z2 - r2 bands are rigid and shifted by the Co doping. The Fe 3dyz/zx hole band is flattened at the optimal doping level x = 0:06, indicating that the band renormalization of the Fe 3dyz/zx band correlates with the enhancement of the superconducting transition temperature. The orbital-dependent and doping-dependent band renormalization indicates that the fluctuations responsible for the superconductivity is deeply related to the Fe 3d orbital degeneracy.

Original languageEnglish
Article number113707
JournalJournal of the Physical Society of Japan
Issue number11
Publication statusPublished - 2011 Nov


  • Angle-resolved photoemission spectroscopy
  • Band renormalization
  • Fe-based superconductors
  • Orbital degeneracy


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