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Type: Artigo de periódico
Title: Spin-orbit-induced Mixed-spin Ground State In Rnio 3 Perovskites Probed By X-ray Absorption Spectroscopy: Insight Into The Metal-to-insulator Transition
Author: Piamonteze C.
De Groot F.M.F.
Tolentino H.C.N.
Ramos A.Y.
Massa N.E.
Alonso J.A.
Martinez-Lope M.J.
Abstract: We report on a Ni L 2,3 edge x-ray absorption spectroscopy study in RNiO 3 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 RNiO 3 perovskites in terms of modifications in the Ni 3+ crystal field splitting that induces a spin transition from an essentially low-spin to a mixed-spin state. ©2005 The American Physical Society.
Citation: Physical Review B - Condensed Matter And Materials Physics. , v. 71, n. 2, p. - , 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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