Abstract
The 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 0 Is 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.
Original language | English |
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Pages (from-to) | 4511-4519 |
Number of pages | 9 |
Journal | Physical Review. B: Condensed Matter and Materials Physics |
Volume | 46 |
Issue number | 8 |
Publication status | Published - 15-Aug-1992 |
Keywords
- ENERGY-LOSS-SPECTROSCOPY
- TRANSITION-METAL OXIDES
- MOLECULAR-ORBITAL STRUCTURE
- EDGE FINE-STRUCTURE
- ELECTRONIC-STRUCTURE
- BAND PHOTOEMISSION
- UNOCCUPIED STATES
- SPECTRA
- LIXNI1-XO
- SYMMETRY