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DY: Dynamik und Statistische Physik
DY 46: Poster
DY 46.91: Poster
Thursday, March 30, 2006, 16:00–18:00, P1
Spin glass models with Lévy-distributed couplings — •Steffen Hohn and Andreas Engel — Carl-von-Ossietzky Universität, 26111 Oldenburg, Germany
A mean-field model for spin glasses is studied in which the distribution of coupling strengths has long tails, P(J)∼ 1/|J|(1+α) for large |J|. The transition temperature Tc to the spin glass phase and the temperature TAT signalling the breakdown of replica symmetry are determined numerically for various values of α using finite size scaling. Moreover the distribution of local magnetic fields for temperatures between Tc and TAT is determined. The results are checked against a novel application of the replica trick to these systems.