INVESTIGADORES
MASSA Nestor Emilio
artículos
Título:
Short-range charge order in RNiO3 perovskites (R=Pr, Nd, Eu, Y) probed by x-ray-absorption spectroscopy
Autor/es:
CÍNTHIA PIAMONTEZE; HÉLIO C. N. TOLENTINO; ALINE Y. RAMOS; NESTOR E. MASSA; JOSE A. ALONSO; MARIA J. MARTÍNEZ-LOPE; MARIA T. CASAIS
Revista:
PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS
Editorial:
American Institute of Physics
Referencias:
Lugar: Mellville; Año: 2005 vol. 71 p. 12104 - 12108
ISSN:
0163-1829
Resumen:
The short-range organization around Ni atoms in orthorhombic RNiO3 sR=Pr, Nd, Eud 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 coexist 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 sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
ground to describe these compounds and sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
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 coexist 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 sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
ground to describe these compounds and sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
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 coexist 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 sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
ground to describe these compounds and sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
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 coexist 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 sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
ground to describe these compounds and sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
RNiO3 sR=Pr, Nd, Eud 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 coexist 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 sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
ground to describe these compounds and sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
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 coexist 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 sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
ground to describe these compounds and sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
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 coexist 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 sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
ground to describe these compounds and sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.
R ion, provides a common
ground to describe these compounds and sheds interesting light in the understanding of the phonon-assisted
conduction mechanism and unusual antiferromagnetism present in all RNiO3 compounds.RNiO3 compounds.