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Transformation of phase transitions driven by an anisotropic random field

V. Popa-Nita

Samo Kralj

  • Faculty of Physics, University of Bucharest, P. O. Box MG-11, Bucharest 76900, Romania

  • Laboratory of Physics of Complex Systems, Faculty of Education, University of Maribor, Koroška 160, 2000 Maribor, Slovenia and Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia

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Phys. Rev. E 71, 042701 – Published 1 April, 2005

DOI: https://doi.org/10.1103/PhysRevE.71.042701

Abstract

We carry out a comparative study of the influence of a random anisotropy field on continuous and discontinuous phase transitions. The ordered phase, which is reached via a continuous symmetry breaking phase transition, is characterized by an order parameter and by a corresponding hydrodynamic continuum field. We assume that the response of the hydrodynamic field to the imposed disorder results in a domainlike pattern of the system. For a strong enough disorder both transitions become gradual. For weaker disorder strengths the disorder converts a second order transition into a discontinuous one.

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Phys. Rev. E 71, 042701– Published 1 April, 2005
  • Received 27 October 2004

© 2005 American Physical Society

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