Continuous versus first order transitions in compressible diluted magnets

Yonathan Shapir and Serge Galam

Physica A: Statistical Mechanics and its Applications, 1996, vol. 224, issue 3, 669-676

Abstract: The interplay between disorder and compressibility in Ising magnets is studied. Contrary to pure systems in which a weak compressibility drives the transition first order, we find from a renormalization group analysis that it has no effect on disordered systems which keep undergoing continuous transition with rigid random-bond Ising model critical exponents. The mean field calculation exhibits a dilution-dependent tricritical point beyond which, at stronger compressibility, the transition is first order. The different behavior of XY and Heisenberg magnets is discussed.

Date: 1996
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:224:y:1996:i:3:p:669-676

DOI: 10.1016/0378-4371(95)00381-9

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