Relaxation study in percolating solids

Ghosh, M. ; Chakrabarti, B. K. ; Majumdar, K. K. ; Chakrabarti, R. N. (1990) Relaxation study in percolating solids Physical Review B, 41 (1). pp. 731-739. ISSN 0163-1829

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The strain-relaxation (creep) behavior of randomly cut metallic networks (of aluminum and copper) near the percolation threshold are studied here experimentally. A crossover from Kohlrausch-type stretched-exponential behavior, for time t less than a crossover time tc, to a normal (exponential) relaxation behavior, for t>tc, is observed. The crossover time (tc) and the relaxation time are found to diverge as disorder approaches the percolation threshold. The value of the stretched-exponential exponent is compared with that expected theoretically from anomalous diffusion on fractals. Such crossover behavior for strain relaxation in percolating networks is compared with the magnetic-relaxation behavior of dilute Ising magnets in two and three dimensions, studied using Monte Carlo simulation techniques. These observations confirm a classical localization or anomalous-diffusion origin of the stretched-exponential relaxation behavior.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:44877
Deposited On:23 Jun 2011 09:54
Last Modified:23 Jun 2011 09:54

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