Abstract
In order to investigate the crossover from the homogeneous behavior to percolative one for two-dimensional system, the temperature T and magnetic field H dependence of the sheet resistance R sq have been measured for thin granular aluminum films. In a magnetic field of 5 T , the conductance σ decreases with decreasing T as σ=α T e 2/(2π 2ℏ) ln T+σ 0 due to weak localization effect. The value of α T decreases when R sq increases beyond 6∼8 kΩ . In the network which does not contain loops smaller than the phase relaxation length, weak localization effect is considered to be suppressed. We have obtained the anomalous T-dependent diffusion constant D from the analysis of the magnetoconductance above T C with use of the fitting parameter D( T). These behaviors can be explained qualitatively by a model of scaling law for percolation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physica E: Low-dimensional Systems and Nanostructures
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
