Short-range charge order in RNiO₃ perovskites (R = Pr, Nd, Eu, Y) probed by x-ray-absorption spectroscopy

The short-range organization around Ni atoms in orthorhombic RNiO₃ (R = Pr, Nd, Eu) perovskites has been studied over a wide temperature range by Ni K-edge x-ray absorption spectroscopy. Our results demonstrate that two different Ni sites, with different average Ni-O bond lengths, coexist in those o...

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Detalles Bibliográficos
Autores principales:	Piamonteze, Cinthia, Tolentino, Hélio C. N., Ramos, Aline Y., Massa, Néstor Emilio, Alonso, José Antonio, Martínez Lope, María Jesús, Casais, Maria T.
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2005
Materias:	Ciencias Exactas Química perovskites spectroscopy orthorhombic compounds phonon-assisted conduction mechanism unusual antiferromagnetism
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/126450
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-126450
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 Química perovskites spectroscopy orthorhombic compounds phonon-assisted conduction mechanism unusual antiferromagnetism
spellingShingle	Ciencias Exactas Química perovskites spectroscopy orthorhombic compounds phonon-assisted conduction mechanism unusual antiferromagnetism Piamonteze, Cinthia Tolentino, Hélio C. N. Ramos, Aline Y. Massa, Néstor Emilio Alonso, José Antonio Martínez Lope, María Jesús Casais, Maria T. Short-range charge order in RNiO₃ perovskites (R = Pr, Nd, Eu, Y) probed by x-ray-absorption spectroscopy
topic_facet	Ciencias Exactas Química perovskites spectroscopy orthorhombic compounds phonon-assisted conduction mechanism unusual antiferromagnetism
description	The short-range organization around Ni atoms in orthorhombic RNiO₃ (R = Pr, Nd, Eu) perovskites has been studied over a wide temperature range by Ni K-edge x-ray absorption spectroscopy. Our results demonstrate that two different Ni sites, with different average Ni-O bond lengths, coexist in those orthorhombic compounds and that important modifications in the Ni nearest neighbors environment take place across the metal-insulator transition. We report evidences for the existence of short-range charge-order in the insulating state, as found in the monoclinic compounds. Moreover, our results suggest that the two different Ni sites coexists even in the metallic state. The coexistence of two different Ni sites, independently on the R ion, provides a common ground to describe these compounds and shed new light in the understanding of the phonon-assisted conduction mechanism and unusual antiferromagnetism present in all RNiO₃ compounds.
format	Articulo Articulo
author	Piamonteze, Cinthia Tolentino, Hélio C. N. Ramos, Aline Y. Massa, Néstor Emilio Alonso, José Antonio Martínez Lope, María Jesús Casais, Maria T.
author_facet	Piamonteze, Cinthia Tolentino, Hélio C. N. Ramos, Aline Y. Massa, Néstor Emilio Alonso, José Antonio Martínez Lope, María Jesús Casais, Maria T.
author_sort	Piamonteze, Cinthia
title	Short-range charge order in RNiO₃ perovskites (R = Pr, Nd, Eu, Y) probed by x-ray-absorption spectroscopy
title_short	Short-range charge order in RNiO₃ perovskites (R = Pr, Nd, Eu, Y) probed by x-ray-absorption spectroscopy
title_full	Short-range charge order in RNiO₃ perovskites (R = Pr, Nd, Eu, Y) probed by x-ray-absorption spectroscopy
title_fullStr	Short-range charge order in RNiO₃ perovskites (R = Pr, Nd, Eu, Y) probed by x-ray-absorption spectroscopy
title_full_unstemmed	Short-range charge order in RNiO₃ perovskites (R = Pr, Nd, Eu, Y) probed by x-ray-absorption spectroscopy
title_sort	short-range charge order in rnio₃ perovskites (r = pr, nd, eu, y) probed by x-ray-absorption spectroscopy
publishDate	2005
url	http://sedici.unlp.edu.ar/handle/10915/126450
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Short-range charge order in RNiO₃ perovskites (R = Pr, Nd, Eu, Y) probed by x-ray-absorption spectroscopy

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