Evidence for Fisher renormalization in the compressible phi4 model.
We present novel Fourier Monte Carlo simulations of a compressible phi4-model on a simple-cubic lattice with linear-quadratic coupling of order parameter and strain, focusing on the detection of fluctuation-induced first-order transitions and deviations from standard critical behavior. The former is indeed observed in the constant stress ensemble and for auxetic systems at constant strain, while for regular isotropic systems at constant strain, we find strong evidence for Fisher-renormalized critical behavior and are led to predict the existence of a tricritical point.
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Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria. andreas.troester@univie.ac.at