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

doi:10.1143/JPSJ.80.113707

Doping-dependent and orbital-dependent band renormalization in Ba(Fe _1-xCo_x)₂As₂ superconductors

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

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

Angle resolved photoemission spectroscopy of Ba(Fe_1-xCo _x)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_x2-y2 and 3z² - r² 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.

Original language	English
Article number	113707
Journal	journal of the physical society of japan
Volume	80
Issue number	11
DOIs	https://doi.org/10.1143/JPSJ.80.113707
Publication status	Published - 2011 Nov

Keywords

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

ASJC Scopus subject areas

Physics and Astronomy(all)

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Doping-dependent and orbital-dependent band renormalization in Ba(Fe _1-xCo_x)₂As₂ superconductors. / Sudayama, Takaaki; Wakisaka, Yuki; Mizokawa, Takashi; Ibuka, Soshi; Morinaga, Rei; Sato, Taku J.; Arita, Masashi; Namatame, Hirofumi; Taniguchi, Masaki; Saini, Naurang L.

In: journal of the physical society of japan, Vol. 80, No. 11, 113707, 11.2011.

Research output: Contribution to journal › Article › peer-review

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

abstract = "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.",

keywords = "Angle-resolved photoemission spectroscopy, Band renormalization, Fe-based superconductors, Orbital degeneracy",

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

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AU - Sudayama, Takaaki

AU - Wakisaka, Yuki

AU - Mizokawa, Takashi

AU - Ibuka, Soshi

AU - Morinaga, Rei

AU - Sato, Taku J.

AU - Arita, Masashi

AU - Namatame, Hirofumi

AU - Taniguchi, Masaki

AU - Saini, Naurang L.

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N2 - 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.

AB - 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.

KW - Angle-resolved photoemission spectroscopy

KW - Band renormalization

KW - Fe-based superconductors

KW - Orbital degeneracy

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