Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/81474
Type: Artigo de periódico
Title: Possible common ground for the metal-insulator phase transition in the rare-earth nickelates RNiO3 (R=Eu, Ho, Y)
Author: de la Cruz, FP
Piamonteze, C
Massa, NE
Salva, H
Alonso, JA
Martinez-Lope, MJ
Casais, MT
Abstract: We report on the infrared spectra of RNiO3 (R=Eu, Ho, Y). They provide evidence of phonon and insulating gap behavior and point to the monoclinic distortion at the metal-insulator (MI) transition as a feature for all RNiO3 (Rnot equalLa). We hypothesize that the intermediate paramagnetic phase (above T-N and below T-MI) in RNiO3 (R=Sm, Eu, Ho, Y) might be consequence of a self-doping effect, gradually triggering a phase segregation in electron-rich and electron-poor regions. This picture is concomitant to the temperature-dependent effect of octahedral tilting and distortion and self-trapped electrons in a polaronic medium.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.66.153104
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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