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Title: Absorption and photoemission spectroscopy of rare-earth oxypnictides
Authors: Kroll, T.Roth, F.Koitzsch, A.Kraus, R.Batchelor, D. R.Werner, J.Behr, G.Büchner, B.Knupfer, M.
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Issue Date: 2009
Published in: New Journal of Physics, Volume 11
Publisher: Milton Park : Taylor & Francis
Abstract: 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.
Keywords: Absorption; Cerium; Cerium compounds; Electronic properties; Electronic structure; Emission spectroscopy; Gadolinium; Luminescence of organic solids; Phase transitions; Photoemission; Superconducting magnets; X ray spectroscopy
DDC: 530
License: CC BY-NC-SA 3.0 Unported
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