2026-04-13T01:21:10Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/106422025-11-19T11:00:05Zcom_2072_1057col_2072_478821col_2072_478822col_2072_478917

00925njm 22002777a 4500 dc Hattink, Bart Jan author Labarta, Amílcar author García del Muro y Solans, Montserrat author Batlle Gelabert, Xavier author Sánchez Barrera, Florencio author Varela Fernández, Manuel, 1956- author 2009-12-29T11:09:20Z 2009-12-29T11:09:20Z 2003 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. Reologia Superfícies (Física) Propietats elèctriques Pel·lícules fines Rheology Surfaces (Physics) Electric properties Thin films Competing tunneling and capacitive paths in Co-ZrO2 granular thin films