The nanostructural origin of the ac conductance in dielectric granular metals: the case study of Co_20(ZrO_2)_80

Thumbnail Image

Date

Authors

Journal Title

Journal ISSN

Volume Title

Publisher

Abstract

Description

We show which is the nanostructure required in granular Co20(ZrO2)80 thin films to produce an ac response such as the one that is universally observed in a very wide variety of dielectric materials. A bimodal size distribution of Co particles yields randomly competing conductance channels which allow both thermally assisted tunneling through small particles and capacitive conductance among larger particles that are further apart. A model consisting on a simple cubic random resistance-capacitor network describes quantitatively the experimental results as functions of temperature and frequency, and enables the determination of the microscopic parameters controlling the ac response of the samples.
Available online at: http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=APPLAB000091000005052108000001&idtype=cvips&gifs=yes

Keywords

Materials Science, Disordered Systems and Neural Networks

Citation

URI

http://salesiana.dossiersoluciones.com/handle/123456789/136152

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0708.2140
 http://arxiv.org/abs/0708.2140
 Appl. Phys. Lett. 91, 052108 (2007)
 doi:10.1063/1.2766858

Collections

arXiv