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Type: Artigo de periódico
Title: Spin-orbit-induced mixed-spin ground state in RNiO3 perovskites probed by x-ray absorption spectroscopy: Insight into the metal-to-insulator transition
Author: Piamonteze, C
de Groot, FMF
Tolentino, HCN
Ramos, AY
Massa, NE
Alonso, JA
Martinez-Lope, MJ
Abstract: We report on a Ni L-2,L-3 edge x-ray absorption spectroscopy study in RNiO3 perovskites. These compounds exhibit a metal-to-insulator (MI) transition as temperature decreases. The L-3 edge presents a clear splitting in the insulating state, associated to a less hybridized ground state. Using charge transfer multiplet calculations, we establish the importance of the crystal field and 3d spin-orbit coupling to create a mixed-spin ground state. We explain the MI transition in RNiO3 perovskites in terms of modifications in the Ni3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state.
Country: EUA
Editor: American Physical Soc
Citation: Physical Review B. American Physical Soc, v. 71, n. 2, 2005.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.71.020406
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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