Electronic structure of La1−xSrxCrO3

Maiti, K. ; Sarma, D. D. (1996) Electronic structure of La1−xSrxCrO3 Physical Review B: Condensed Matter and Materials Physics, 54 (11). pp. 7816-7822. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v54/i11/p7816_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.54.7816

Abstract

LaCrO3 is a wide-band-gap insulator which does not evolve to a metallic state even after hole doping. We report electronic structure of this compound and its Sr substituents investigated by photoemission and inverse photoemission spectroscopies in conjunction with various calculations. The results show that LaCrO3 is close to the Mott-Hubbard insulating regime with a gap of about 2.8 eV. Analysis of Cr 2p core-level spectrum suggests that the intra-atomic Coulomb interaction strength and the charge-transfer energy to be 5.0 and 5.5 eV, respectively. We also estimate the intra-atomic exchange interaction strength and a crystal-field splitting of about 0.7 and 2.0 eV, respectively. Sr substitution leading to hole doping in this system decreases the charge-excitation gap, but never collapses it to give a metallic behavior. The changes in the occupied as well as unoccupied spectral features are discussed in terms of the formation of local Cr4+ configurations arising from strong electron-phonon interactions.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:46359
Deposited On:04 Jul 2011 11:52
Last Modified:17 Jul 2012 16:09

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