Doping-Dependent and Orbital-Dependent Band Renormalization in Ba(Fe1-xCox)2As2 Superconductors

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概要

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• 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.

• 2011-11-15

著者

• Mizokawa Takashi

  Department Of Complexity Science And Engineering And Department Of Physics University Of Tokyo

• Sudayama Takaaki

  Department Of Physics And Department Of Complexity Science And Engineering University Of Tokyo

• Taniguchi Masaki

  Hiroshima Synchrotron Radiation Center Hiroshima University

• Sato Taku

  Institute For Solid State Physics The University Of Tokyo

• Saini Naurang

  Department of Physics, Universitá di Roma ``La Sapienza'', Piazalle Aldo Moro 2, 00185 Roma, Italy

• Namatame Hirofumi

  Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashihiroshima, Hiroshima 739-0046, Japan

• Wakisaka Yuki

  Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

• Namatame Hirofumi

  Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University, Higashihiroshima, Hiroshima 739-0046, Japan

• Arita Masashi

  Hiroshima Synchrotron Radiation Center (HSRC), Hiroshima University, Higashihiroshima, Hiroshima 739-0046, Japan

• Ibuka Soshi

  Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106, Japan

• Morinaga Rei

  Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106, Japan

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