| Full text | |
| Author(s): |
Sergeenkov, S.
;
Cichetto, Jr., L.
;
Diaz, J. C. C. A.
;
Bastos, W. B.
;
Longo, E.
;
Araujo-Moreira, F. M.
Total Authors: 6
|
| Document type: | Journal article |
| Source: | JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS; v. 98, p. 38-42, NOV 2016. |
| Web of Science Citations: | 5 |
| Abstract | |
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) | |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |
| FAPESP's process: | 14/01371-5 - Obtention of memories with LaNiO3 and LaNiO3/BaTiO3 using PLD |
| Grantee: | Leonélio Cichetto Junior |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |