Ising Spin Glasses : interaction distribution dependence of the critical exponents

Details Ising Spin Glasses : interaction distribution dependence of the critical exponents Ising Spin Glasses : interaction distribution dependence of the critical exponents

2001-11-09

arxiv.org/abs/cond-mat/0111174v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages 2 figures

Scientific paper

Continuous phase transitions are catalogued into universality classes, families of systems having identical values of all the exponents governing the critical behaviour of their different physical properties. Numerical simulations have been carried out on Ising Spin Glasses in dimension three, using a technique where corrections to finite size scaling can be controled. The data show that the critical exponents vary strongly as a function of the kurtosis of the interaction distribution, a parameter which from the standard point of view should not be pertinent. This observation implies that for spin glasses the renormalization group analysis should not be approached in a the same way as in the case of canonical second order transitions; a much richer structure of universality classes would appear to exist for spin glasses.

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