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Title: Metallic state and the metal-insulator transition of NdNiO3
Author: Granados García, Xavier
Fontcuberta i Griñó, Josep
Obradors, Xavier
Mañosa, Lluís
Torrance, J. B.
Keywords: Conductivitat elèctrica
Metalls de transició
Electric conductivity
Transition metals
Issue Date: 1993
Publisher: The American Physical Society
Abstract: 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.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 1993, vol. 48, núm. 16, p. 11666-11672.
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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