Doping-Dependent and Orbital-Dependent Band Renormalization in Ba(Fe1-xCox)(2)As-2 Superconductors

作者：Sudayama Takaaki^*; Wakisaka Yuki; Mizokawa Takashi; Ibuka Soshi; Morinaga Rei; Sato Taku J; Arita Masashi; Namatame Hirofumi; Taniguchi Masaki; Saini Naurang L

来源：Journal of the Physical Society of Japan, 2011, 80(11): 113707.

DOI：10.1143/JPSJ.80.113707

• Fe-based superconductors
• angle-resolved photoemission spectroscopy
• band renormalization
• orbital degeneracy

Angle resolved photoemission spectroscopy of Ba(Fe1-xCox)(2)As-2 (x = 0.06, 0.14, and 0.24) shows that the width of the Fe 3d(yz/zx) hole band depends on the doping level. In contrast, the Fe 3d(x2-y2) and 3z(2) - r(2) bands are rigid and shifted by the Co doping. The Fe 3d(yz/zx) hole band is flattened at the optimal doping level x = 0.06, indicating that the band renormalization of the Fe 3d(yz/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.

• 出版日期2011-11