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Metallic state and the metal-insulator transition of NdNiO3
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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.
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GRANADOS GARCÍA, Xavier, et al. Metallic state and the metal-insulator transition of NdNiO3. Physical Review B. 1993. Vol. 48, num. 16, pags. 11666-11672. ISSN 0163-1829. [consulted: 2 of October of 2026]. Available at: https://hdl.handle.net/2445/9907