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Proceedings Paper

Noise near charge ordering transitions
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Paper Abstract

We analyze the noise fluctuations near charge ordering transitions in disordered materials. In particular we consider a two-dimensional (2D) system at finite temperature with a fixed number of defect sites and increase the number of mobile charges. We find that for a high density of charges the system forms a high mobility liquid with low spectral power and a white noise characteristic. As the density of charges is lowered we find a coexistence of liquid regions with locally frozen regions. In this regime the noise power is high and has a 1/fα form with α ~ 0.5 to 1.5. For the low charge density regime we find a disordered frozen regime where all the charges are localized. We also find that for increasing temperature the noise power drops. We compare our results to recent noise experiments on the 2D metal-insulator transition and the vortex-liquid to vortex glass transition found in superconductors.

Paper Details

Date Published: 25 May 2004
PDF: 11 pages
Proc. SPIE 5469, Fluctuations and Noise in Materials, (25 May 2004); doi: 10.1117/12.546861
Show Author Affiliations
Charles M Reichhardt, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 5469:
Fluctuations and Noise in Materials
Dragana Popovic; Michael B. Weissman; Zoltan A. Racz, Editor(s)

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