Electronic structure of La1-xSrxCrO3


Autoria(s): Maiti, K; Sarma, DD
Data(s)

15/09/1996

Resumo

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 LaCrO 3 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.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/19415/1/Electronic_structure.pdf

Maiti, K and Sarma, DD (1996) Electronic structure of La1-xSrxCrO3. In: Physical Review B, 54 (11). pp. 7816-7822.

Publicador

American Physical Society

Relação

http://prola.aps.org/abstract/PRB/v54/i11/p7816_1

http://eprints.iisc.ernet.in/19415/

Palavras-Chave #Solid State & Structural Chemistry Unit
Tipo

Journal Article

PeerReviewed