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Controlled-valence properties of La1-x Srx FeO3 and La1-x Srx MnO3 studied by soft-x-ray absorption spectroscopy

AuthorsAbbate, M.; Groot, Frank M. F. de; Fuggle, J. C.; Fujimori, A.; Strebel, O.; López, María Francisca ; Domke, M.; Kaindl, G.; Sawatzky, G. A.; Takano, M.; Takeda, Y.; Eisaki, H.; Uchida, S.
Issue Date15-Aug-1992
PublisherAmerican Physical Society
CitationPhysical Review B 46(8): 4511 (1992)
AbstractThe controlled-valence properties of La1−xSrxFeO3 and La1−xSrxMnO3 are studied by means of soft-x-ray absorption spectroscopy. A comparison between the transition-metal 2p spectra and atomic-multiplet calculations is used to determine the 3d count. The O 1s spectrum is used to characterize changes in unoccupied states that contain oxygen p character. The results indicate that the holes induced by substitution for both series are located in states of mixed metal 3d–oxygen 2p character. The ground state of LaFeO3 is mainly 3d5 and becomes 3d5L (where L denotes a ligand hole) in the La1−xSrxFeO3 series for low Sr concentration. The main component of the ground state of LaMnO3 is 3d4 and becomes a mixture of 3d3 and 3d4L in the La1−xSrxMnO3 series. The trends in controlled- valence properties of similar oxides across the transition-metal series can be rationalized within the framework of the Zaanen-Sawatzky-Allen model.
Publisher version (URL)https://doi.org/10.1103/PhysRevB.46.4511
Appears in Collections:(ICMM) Artículos
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