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Title:
O1s and Mn2p NEXAFS on single-layered La1-xSr1+xMnO4: crystal field effect versus orbital coupling mechanism
Authors:
Merz, M.; Reutler, P.; Büchner, B.; Arena, D.; Dvorak, J.; Idzerda, Y. U.; Tokumitsu, S.; Schuppler, S.
Affiliation:
AA(Institut für Kristallographie, Jägerstraße 17-19, RWTH Aachen, 52066 Aachen, Germany; ), AB(Institute for Solid State Research, IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany), AC(Institute for Solid State Research, IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany), AD(Naval Research Laboratory, Code 6345, Washington, DC 20375, USA), AE(Department of Physics, Montana State University, Bozeman, MT 59717-3840, USA), AF(Department of Physics, Montana State University, Bozeman, MT 59717-3840, USA), AG(Forschungszentrum Karlsruhe, Institut für Festkörperphysik, 76021 Karlsruhe, Germany), AH(Forschungszentrum Karlsruhe, Institut für Festkörperphysik, 76021 Karlsruhe, Germany)
Publication:
The European Physical Journal B, Volume 51, Issue 3, June I 2006, pp.315-319 (EPJB Homepage)
Publication Date:
06/2006
Origin:
EDP Sciences
PACS Keywords:
Electronic structure, Effects of crystal defects, doping and substitution, X-ray absorption spectra
Abstract Copyright:
(c) 2006: EDP Sciences/Società Italiana di Fisica/Springer-Verlag
DOI:
10.1140/epjb/e2006-00228-4
Bibliographic Code:
2006EPJB...51..315M

Abstract

O1s and Mn2p near-edge X-ray absorption spectroscopy on La1-xSr1+xMnO4 (0 ≤x ≤0.5) single crystals shows that Sr doping does not only provide holes to the system but also induces a continuous transfer of electrons from out-of-plane d3z2-r2 to in-plane d3x2-r2/d3y2-r2 orbitals. Furthermore, a non-vanishing electron occupation of in-plane dx2-y2 and out-of-plane d3z2-r2 orbitals is observed up to relatively high doping contents. These findings demonstrate that the energy difference between all these orbital types has to be very small and manifest that the orbital degree of freedom is determined not just by crystal field effects but also by orbital coupling. Moreover, the doping-dependent transfer of spectral weight observed in the current data identifies La1-xSr1+xMnO4 as a charge-transfer insulator.
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