Phase separation in binary systems with competing internal and external multiplicative noises |
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Authors: | D O Kharchenko I O Lysenko and S V Kokhan |
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Institution: | (1) INFM, Unitá di Palermo and Dipartimento di Fisica e Tecnologie Relative - Universitá di Palermo, Viale delle Scienze, pad.18, 90128 Palermo, Italy;(2) Radiophysics Department, Nizhny Novgorod State University, 23 Gagarin Ave., 603950 Nizhny Novgorod, Russia |
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Abstract: | We have considered phase separation processes in binary stochastic systems with thermal diffusion and ballistic mixing representing
irradiation influence. Introducing fluctuations of thermal flux and an external source of atom relocations due to ballistic
diffusion into dynamics of a globally conserved field, we have shown that there are two competing mechanisms of phase transitions
type of “order-disorder”: thermally assisted diffusion and irradiation induced atomic exchange. We have studied dynamics of
the structure function at early stages of decomposition. In the framework of the mean field theory we have derived the effective
Fokker-Planck equation to describe phase separation processes. It was shown that the ordering processes can be controlled
by both regular and stochastic parts of external source influence. A reentrant behavior of a mean field order parameter versus
the external noise intensity and fluctuations correlation radius is found. |
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Keywords: | |
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