Possible common ground for the metal-insulator phase transition in the rare-earth nickelates <i>R</i>NiO₃ (R = Eu, Ho, Y)

We report on the infrared spectra of <i>R</i>NiO₃ (<i>R</i> = E, 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 <i>R</i>NiO₃ (<i>R</i&g...

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Autores principales: Cruz, Fernando P. de la, Piamonteze, Cínthia, Massa, Néstor Emilio, Salva, Horacio, Alonso, José Antonio, Martínez Lope, María Jesús, Casais, María Teresa
Formato: Articulo
Lenguaje:Inglés
Publicado: 2002
Materias:
Ciencias Exactas
infrared spectra
phonon and insulating gap behavior
intermediate paramagnetic phase
self-doping effect
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/126303
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-126303
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
infrared spectra
phonon and insulating gap behavior
intermediate paramagnetic phase
self-doping effect
spellingShingle Ciencias Exactas
infrared spectra
phonon and insulating gap behavior
intermediate paramagnetic phase
self-doping effect
Cruz, Fernando P. de la
Piamonteze, Cínthia
Massa, Néstor Emilio
Salva, Horacio
Alonso, José Antonio
Martínez Lope, María Jesús
Casais, María Teresa
Possible common ground for the metal-insulator phase transition in the rare-earth nickelates <i>R</i>NiO₃ (R = Eu, Ho, Y)
topic_facet Ciencias Exactas
infrared spectra
phonon and insulating gap behavior
intermediate paramagnetic phase
self-doping effect
description We report on the infrared spectra of <i>R</i>NiO₃ (<i>R</i> = E, 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 <i>R</i>NiO₃ (<i>R</i> ≠ La). We hypothesize that the intermediate paramagnetic phase (above T<sub>N</sub> and below T<sub>MI</sub> in <i>R</i>NiO₃ (<i>R</i> = 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.
format Articulo
Articulo
author Cruz, Fernando P. de la
Piamonteze, Cínthia
Massa, Néstor Emilio
Salva, Horacio
Alonso, José Antonio
Martínez Lope, María Jesús
Casais, María Teresa
author_facet Cruz, Fernando P. de la
Piamonteze, Cínthia
Massa, Néstor Emilio
Salva, Horacio
Alonso, José Antonio
Martínez Lope, María Jesús
Casais, María Teresa
author_sort Cruz, Fernando P. de la
title Possible common ground for the metal-insulator phase transition in the rare-earth nickelates <i>R</i>NiO₃ (R = Eu, Ho, Y)
title_short Possible common ground for the metal-insulator phase transition in the rare-earth nickelates <i>R</i>NiO₃ (R = Eu, Ho, Y)
title_full Possible common ground for the metal-insulator phase transition in the rare-earth nickelates <i>R</i>NiO₃ (R = Eu, Ho, Y)
title_fullStr Possible common ground for the metal-insulator phase transition in the rare-earth nickelates <i>R</i>NiO₃ (R = Eu, Ho, Y)
title_full_unstemmed Possible common ground for the metal-insulator phase transition in the rare-earth nickelates <i>R</i>NiO₃ (R = Eu, Ho, Y)
title_sort possible common ground for the metal-insulator phase transition in the rare-earth nickelates <i>r</i>nio₃ (r = eu, ho, y)
publishDate 2002
url http://sedici.unlp.edu.ar/handle/10915/126303
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