Absorption and photoemission spectroscopy of rare-earth oxypnictides

Details Absorption and photoemission spectroscopy of rare-earth oxypnictides Absorption and photoemission spectroscopy of rare-earth oxypnictides

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11b5019k&link_type=abstract

New Journal of Physics, Volume 11, Issue 2, pp. 025019 (2009).

Physics

2

Scientific paper

The electronic structure of various rare-earth oxypnictides has been investigated by performing Fe L2, 3 x-ray absorption spectroscopy, and Fe 2p and valence band x-ray photoemission spectroscopy. As representative samples the non-superconducting parent compounds LnFeAsO (Ln=La, Ce, Sm and Gd) have been chosen and measured at 25 and 300 K, i.e. below and above the structural and magnetic phase transition at ~150 K. We find no significant change of the electronic structure of the FeAs layers when switching between the different rare-earth ions or when varying the temperature below and above the transition temperatures. Using a simple two-configuration model, we find qualitative agreement with the Fe 2p3/2 core-level spectrum, which allows for a qualitative explanation of the experimental spectral shapes.

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