Affordable Access

deepdyve-link
Publisher Website

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

Authors
  • Konstantinovic, Z
  • del Muro, M Garcia
  • Batlle, X
  • Labarta, A
  • Varela, M.
Type
Published Article
Publication Date
Aug 16, 2007
Submission Date
Aug 16, 2007
Identifiers
DOI: 10.1063/1.2766858
Source
arXiv
License
Unknown
External links

Abstract

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.

Report this publication

Statistics

Seen <100 times