Phase transitions in disordered systems can be smeared if rare spatial regions develop true static order while the bulk system is in the disordered phase. Here, we study the effects of spatial disorder correlations on such smeared phase transitions. The behaviors of observables are determined within optimal fluctuation theory. We show that even short-range correlations can qualitatively modify smeared phase transitions. For positive correlations (like impurity atoms attract each other), the order parameter is enhanced, while it is suppressed for repulsive correlations (like atoms repel each other). We use computer simulations to generate various types of disorder correlations, and to verify our theoretical predictions.
D. Nozadze et al., "Modification of Smeared Phase Transitions by Spatial Disorder Correlations," AIP Conference Proceedings, vol. 1550, pp. 263-267, American Institute of Physics (AIP), Aug 2013.
The definitive version is available at http://dx.doi.org/10.1063/1.4818407
17th Training Course in the Physics of Strongly Correlated Systems (2012: Oct. 1-12, Salerno, Italy)
Keywords and Phrases
optimal fluctuation theory; smeared phase transitions; spatial disorder correlations
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Article - Conference proceedings
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