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Title: Competing tunneling and capacitive paths in Co-ZrO2 granular thin films
Author: Hattink, Bart Jan
Labarta, Amílcar
García del Muro y Solans, Montserrat
Batlle Gelabert, Xavier
Sánchez Barrera, Florencio
Varela Fernández, Manuel, 1956-
Keywords: Reologia
Superfícies (Física)
Propietats elèctriques
Pel·lícules fines
Surfaces (Physics)
Electric properties
Thin films
Issue Date: 2003
Publisher: The American Physical Society
Abstract: The ac electrical response is studied in thin films composed of well-defined nanometric Co particles embedded in an insulating ZrO2 matrix which tends to coat them, preventing the formation of aggregates. In the dielectric regime, ac transport originates from the competition between interparticle capacitive Cp and tunneling Rt channels, the latter being thermally assisted. This competition yields an absorption phenomenon at a characteristic frequency 1/(RtCp), which is observed in the range 1010 000 Hz. In this way, the effective ac properties mimic the universal response of disordered dielectric materials. Temperature and frequency determine the complexity and nature of the ac electrical paths, which have been successfully modeled by an Rt-Cp network.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 2003, vol. 67, núm. 3, p. 033402-1-033402-4
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)
Articles publicats en revistes (Física Aplicada)

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