Metallic state and the metal-insulator transition of NdNiO3
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-o...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1993 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/9907 |
| Acceso en línea: | https://hdl.handle.net/2445/9907 |
| Access Level: | acceso abierto |
| Palabra clave: | Conductivitat elèctrica Metalls de transició Semiconductors Electric conductivity Transition metals |
| Sumario: | 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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