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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, FP|
|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.|
|Editor:||American Physical Soc|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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