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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 F.P.
Piamonteze C.
Massa N.E.
Salva H.
Alonso J.A.
Martinez-Lope M.J.
Casais M.T.
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 (R ≠ La). We hypothesize that the intermediate paramagnetic phase (above TN and below TMI) 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.
Rights: aberto
Identifier DOI: 
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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