Ac conductance in granular insulating Co-ZrO2 thin films: A universal response

The ac conductance in granular insulating Co-ZrO 2 thin films prepared by pulsed laser deposition is systematically studied as a function of the Co volume content x . An absorption phenomenon at low frequencies that mimics the universal response of disordered dielectric materials is observed in the...

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Autores: Konstantinović, Zorica, García del Muro y Solans, Montserrat, Kovylina, Miroslavna, Batlle Gelabert, Xavier, Labarta, Amílcar
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2009
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/10933
Acceso en línea:https://hdl.handle.net/2445/10933
Access Level:acceso abierto
Palabra clave:Cristal·lografia
Superfícies (Física)
Pel·lícules fines
Crystallography
Surfaces (Physics)
Thin films
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spelling Ac conductance in granular insulating Co-ZrO2 thin films: A universal responseKonstantinović, ZoricaGarcía del Muro y Solans, MontserratKovylina, MiroslavnaBatlle Gelabert, XavierLabarta, AmílcarCristal·lografiaSuperfícies (Física)Pel·lícules finesCrystallographySurfaces (Physics)Thin filmsThe ac conductance in granular insulating Co-ZrO 2 thin films prepared by pulsed laser deposition is systematically studied as a function of the Co volume content x . An absorption phenomenon at low frequencies that mimics the universal response of disordered dielectric materials is observed in the range of metal content below the Co percolation threshold x p ≈ 0.35 in the so-called dielectric regime. The temperature and frequency dependences of this absorption phenomenon are successfully analyzed in terms of random competing conduction channels between Co particles through thermally assisted tunneling and capacitive conductance. The ac conductance is well correlated with the nanostructure of the samples obtained by the transmission electron microscopy and perfectly matches the calculated ac response for a random resistor-capacitor network. We also show the occurrence of fractional power-law dependences on the frequency of the ac conductance taking place at very low frequencies as compared to the typical ranges at which dispersive behavior is observed in classical-disordered dielectric materials.The American Physical Society2009info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/10933Articles publicats en revistes (Física de la Matèria Condensada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.79.094201Physical Review B, 2009, vol. 79, núm. 9, p. 094201-1-094201-8http://dx.doi.org/10.1103/PhysRevB.79.094201(c) The American Physical Society, 2009info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/109332026-05-27T06:46:51Z
dc.title.none.fl_str_mv Ac conductance in granular insulating Co-ZrO2 thin films: A universal response
title Ac conductance in granular insulating Co-ZrO2 thin films: A universal response
spellingShingle Ac conductance in granular insulating Co-ZrO2 thin films: A universal response
Konstantinović, Zorica
Cristal·lografia
Superfícies (Física)
Pel·lícules fines
Crystallography
Surfaces (Physics)
Thin films
title_short Ac conductance in granular insulating Co-ZrO2 thin films: A universal response
title_full Ac conductance in granular insulating Co-ZrO2 thin films: A universal response
title_fullStr Ac conductance in granular insulating Co-ZrO2 thin films: A universal response
title_full_unstemmed Ac conductance in granular insulating Co-ZrO2 thin films: A universal response
title_sort Ac conductance in granular insulating Co-ZrO2 thin films: A universal response
dc.creator.none.fl_str_mv Konstantinović, Zorica
García del Muro y Solans, Montserrat
Kovylina, Miroslavna
Batlle Gelabert, Xavier
Labarta, Amílcar
author Konstantinović, Zorica
author_facet Konstantinović, Zorica
García del Muro y Solans, Montserrat
Kovylina, Miroslavna
Batlle Gelabert, Xavier
Labarta, Amílcar
author_role author
author2 García del Muro y Solans, Montserrat
Kovylina, Miroslavna
Batlle Gelabert, Xavier
Labarta, Amílcar
author2_role author
author
author
author
dc.subject.none.fl_str_mv Cristal·lografia
Superfícies (Física)
Pel·lícules fines
Crystallography
Surfaces (Physics)
Thin films
topic Cristal·lografia
Superfícies (Física)
Pel·lícules fines
Crystallography
Surfaces (Physics)
Thin films
description The ac conductance in granular insulating Co-ZrO 2 thin films prepared by pulsed laser deposition is systematically studied as a function of the Co volume content x . An absorption phenomenon at low frequencies that mimics the universal response of disordered dielectric materials is observed in the range of metal content below the Co percolation threshold x p ≈ 0.35 in the so-called dielectric regime. The temperature and frequency dependences of this absorption phenomenon are successfully analyzed in terms of random competing conduction channels between Co particles through thermally assisted tunneling and capacitive conductance. The ac conductance is well correlated with the nanostructure of the samples obtained by the transmission electron microscopy and perfectly matches the calculated ac response for a random resistor-capacitor network. We also show the occurrence of fractional power-law dependences on the frequency of the ac conductance taking place at very low frequencies as compared to the typical ranges at which dispersive behavior is observed in classical-disordered dielectric materials.
publishDate 2009
dc.date.none.fl_str_mv 2009
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/10933
url https://hdl.handle.net/2445/10933
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.79.094201
Physical Review B, 2009, vol. 79, núm. 9, p. 094201-1-094201-8
http://dx.doi.org/10.1103/PhysRevB.79.094201
dc.rights.none.fl_str_mv (c) The American Physical Society, 2009
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The American Physical Society, 2009
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv The American Physical Society
publisher.none.fl_str_mv The American Physical Society
dc.source.none.fl_str_mv Articles publicats en revistes (Física de la Matèria Condensada)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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