Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 80, Issue 11, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.80.113707
Keywords
Fe-based superconductors; angle-resolved photoemission spectroscopy; band renormalization; orbital degeneracy
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- Grants-in-Aid for Scientific Research [23340097] Funding Source: KAKEN
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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.
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