Electronic Structure and Electron Correlation in LaFeAsO1-xFx and LaFePO1-xFx
Abstract
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 2 p 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 3 p \to 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.
- Publication:
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Journal of the Physical Society of Japan
- Pub Date:
- September 2008
- DOI:
- 10.1143/JPSJ.77.093714
- arXiv:
- arXiv:0806.3860
- Bibcode:
- 2008JPSJ...77i3714M
- Keywords:
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- Condensed Matter - Superconductivity;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 4 pages, 5 figures