Volume 76, Number 6, December 2006
|Page(s)||1144 - 1150|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||24 November 2006|
Electron transport properties in composite antidot arrays
Centre for Superconducting and Magnetic Materials, Department of Physics National University of Singapore - 2 Science Drive 3, Singapore 117542, Singapore
Corresponding author: firstname.lastname@example.org
Accepted: 30 October 2006
A complex disordered system composed of composite material and mesoscopic pore arrays was developed by depositing CoAlO composite thin films on the multiporous anodic aluminum oxide (AAO) membranes. In the disordered antidot arrays, self-connectivity of the metallic phase was dependent on the local conduction geometries. This led to locally variable thresholds for electron percolation. Metallic and semiconductor-like conduction behaviors were simultaneously found in the antidot arrays at thickness less than , while the reference continuous films only showed metallic behavior. The observed non-monotonous resistance-temperature relations were explained by configuring a tetragonally oriented random resistor network related to the constrained conduction geometries, where electron conductions controlled by both percolation and tunneling coexisted. The tunneling effect was more evidently manifested in an antidot array with increased structural disorders. In this case the temperature dependence of resistance well followed the typical power law mode, with . It was consistent with the characteristic of highly disordered metallic granular systems, where Coulomb charging energy as well as the aluminum oxide barrier would play a key role for electron tunneling between nanometer-sized granules. Our experimental results indicated that electron conductions in a composite antidot array were closely related to its constrained mesoscopic geometries.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 72.80.Tm – Composite materials
© EDP Sciences, 2006
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.