| Texto completo | |
| Autor(es): |
Sergeenkov, S.
;
Cichetto, Jr., L.
;
Diaz, J. C. C. A.
;
Bastos, W. B.
;
Longo, E.
;
Araujo-Moreira, F. M.
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS; v. 98, p. 38-42, NOV 2016. |
| Citações Web of Science: | 5 |
| Resumo | |
We demonstrate manifestation of some rather unusual size effects in granular thin films prepared by a pulsed laser deposition technique. We observed that the temperature dependence of resistivity rho(T) notably depends on the relation between the grain size R-g and the film thickness d. Namely, more granular LaNiO3 thin films (with small values of R-g) grown on LaAlO3 substrate are found to follow a universal rho(T) proportional to T-3/2 law for all the measured temperatures. While less granular thin films (with larger values of R-g), exhibit a more complicated behavior accompanied by a clear-cut crossover (around T-cr = 200 K), from rho(T) proportional to T-3/2 (for 20 K < T < 200 K) to rho(T) proportional to T (for 200 K < T < 300 K). The obtained results are attributed to manifestation of the finite temperature size effects (when an average grain size R-g becomes comparable with the thermal de Broglie wavelength A) leading to the crossover temperature T-cr proportional to (diRg)(2). (C) 2016 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais |
| Beneficiário: | Elson Longo da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 14/01371-5 - Obtenção de memórias com LaNiO3 e LaNiO3/BaTiO3 utilizando PLD |
| Beneficiário: | Leonélio Cichetto Junior |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |