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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Manifestation of unusual size effects in granular thin films prepared by pulsed laser deposition

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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 type: 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 type: Scholarships in Brazil - Post-Doctorate