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Phase separation in binary systems with competing internal and external multiplicative noises

  • Statistical and Nonlinear Physics
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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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Authors and Affiliations

  1. Institute of Applied Physics, 58, Petropavlovskaya St., 40030, Sumy, Ukraine

    D. O. Kharchenko, I. O. Lysenko & S. V. Kokhan

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  1. D. O. Kharchenko
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  2. I. O. Lysenko
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  3. S. V. Kokhan
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Correspondence to D. O. Kharchenko.

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Kharchenko, D., Lysenko, I. & Kokhan, S. Phase separation in binary systems with competing internal and external multiplicative noises. Eur. Phys. J. B 76, 37–48 (2010). https://doi.org/10.1140/epjb/e2010-00172-8

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  • DOI: https://doi.org/10.1140/epjb/e2010-00172-8

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