Comparative study of the unoccupied electronic structure of La1-xCaxMnO3 and LaMnO3+delta using O 1s X-ray absorption spectroscopy

We studied the unoccupied electronic structure of La1-xCaxMnO3 and LaMnO3+d elta using O 1s X-ray absorption spectroscopy. The spectra reflect, through the oxygen-metal hybridization, the different metal bands. The first struc ture just above the threshold corresponds to the unoccupied Mn 3d bands. Th e experimental results show that the unoccupied Mn 3d bands of LaMnO3+delta are similar to those of La1-xCaxMnO3. This is surprising, considering the fact that the mechanisms of hole doping are completely different. The resul ts indicate that the potential disorder does not play a dominant role in th ese compounds. This helps us to explain the surprising similarities in the physical properties of these compounds. (C) 1999 Elsevier Science Ltd. All rights reserved.