期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 77, 期 9, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.77.093714
关键词
LaFeAsO; electronic structure; photoemission spectroscopy
资金
- Ministry of Education, Culture. Sports, Science and Technology (MEXT)
- CREST, Japan Science and Technology Agency
- Photon Factory Program Advisory Committee [2006S2-001]
Photoemission spectroscopy is used to investigate the electronic structure of the newly discovered iron-based superconductors LaFeAsO1-xFx and LaFePO1-xFx. Line shapes of the Fe 2p core-level spectra suggest an itinerant character of Fe 3d electrons. The valence-band spectra are generally consistent with band-structure calculations except for the shifts of Fe 3d-derived peaks toward the Fermi level. From the spectra taken in the Fe 3p -> 3d core-absorption region, we have obtained the experimental Fe 3d partial density of states, and explained it in terms of a band-structure calculation with a phenomenological self-energy correction, yielding a mass renormalization factor of <= 2.
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