Título:
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Metallic state and the metal-insulator transition of NdNiO3
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Autor/a:
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Granados García, Xavier; Fontcuberta i Griñó, Josep; Obradors, Xavier; Mañosa, Lluís; Torrance, J. B.
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Otros autores:
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Universitat de Barcelona |
Abstract:
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We report detailed measurements of the electrical resistivity, Seebeck coefficient, and differential scanning calorimetry across the metal-insulator (MI) transition (
T
MI
≊205 K) of
NdNiO
3
. As in the isostructural oxide
PrNiO
3
, the transition is extremely hysteretic, consistent with the first-order character of the transition. Analysis of the data shows that metallic and nonmetallic phases coexist in a broad temperature interval (≊70 K). The electrical resistivity and Seebeck coefficients of the metallic state display a clear linear temperature dependence. These properties can be rationalized in terms of a Fermi gas picture of rather heavy electrons (effective mass of about 6
m
0
). Some physical parameters of the gas are predicted. The entropy change across the MI transition has been measured and it has been used to predict a strong pressure dependence of the MI transition temperature:
dT
MI
/dP≊-4.8 K/kbar. |
Materia(s):
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-Conductivitat elèctrica -Metalls de transició -Semiconductors -Electric conductivity -Transition metals -Semiconductors |
Derechos:
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(c) The American Physical Society, 1993
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Tipo de documento:
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Artículo Artículo - Versión publicada |
Editor:
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The American Physical Society
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Compartir:
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