Continuous Versus First Order Transitions in Compressible Diluted Magnets

Details Continuous Versus First Order Transitions in Compressible Diluted Magnets Continuous Versus First Order Transitions in Compressible Diluted Magnets

1996-06-17

arxiv.org/abs/cond-mat/9606121v1

Physica A 224, 669 (1996)

Physics

Condensed Matter

16 pages, latex, 2 figures not included

Scientific paper

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.

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