Doping-Dependent and Orbital-Dependent Band Renormalization in Ba(Fe_1-xCo_x)_2As_2 Superconductors

T. Sudayama; Y. Wakisaka; T. Mizokawa; S. Ibuka; R. Morinaga; T. J. Sato; M. Arita; H. Namatame; M. Taniguchi; N. L. Saini

doi:10.1143/JPSJ.80.113707

Doping-Dependent and Orbital-Dependent Band Renormalization in Ba(Fe_1-xCo_x)_2As_2 Superconductors

Superconductivity 2012-06-15 v1 Strongly Correlated Electrons

Authors: T. Sudayama , Y. Wakisaka , T. Mizokawa , S. Ibuka , R. Morinaga , T. J. Sato , M. Arita , H. Namatame , M. Taniguchi , N. L. Saini

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Abstract

Angle resolved photoemission spectroscopy of Ba(Fe1-xCox)2As2 (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 x^2-y^2 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.

Keywords

band renormalization doping dependence orbital dependence iron-based superconductor ARPES Ba(Fe1-xCox)2As2

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@article{arxiv.1206.2985,
  title  = {Doping-Dependent and Orbital-Dependent Band Renormalization in Ba(Fe_1-xCo_x)_2As_2 Superconductors},
  author = {T. Sudayama and Y. Wakisaka and T. Mizokawa and S. Ibuka and R. Morinaga and T. J. Sato and M. Arita and H. Namatame and M. Taniguchi and N. L. Saini},
  journal= {arXiv preprint arXiv:1206.2985},
  year   = {2012}
}

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5 pages, 4 figures

Doping-Dependent and Orbital-Dependent Band Renormalization in Ba(Fe_1-xCo_x)_2As_2 Superconductors

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