Berlin 2008 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 8: Glasses II (joint session DF/DY)
DF 8.6: Vortrag
Dienstag, 26. Februar 2008, 15:45–16:00, EB 407
The critical behavior of 3D Ising spin glass models: universality and scaling corrections — •Martin Hasenbusch1, Andrea Pelissetto2, and Ettore Vicari3 — 1Institut für theoretische Physik, Universität Leipzig, Postfach 100920, 04009 Leipzig, Deutschland — 2Dipartimento di Fisica dell'Universita di Roma I and I.N.F.N., I-00185 Roma, Italy — 3Dipartimento di Fisica dell'Universita di Pisa and I.N.F.N., I-56127 Pisa, Italy
We perform high-statistics Monte Carlo simulations of three three-dimensional Ising spin glass models: the +-J Ising model for two values of the disorder parameter p, p=1/2 and p=0.7, and the bond-diluted +-J model for bond-occupation probability p_b = 0.45. A finite-size scaling analysis of the quartic cumulants at the critical point shows conclusively that these models belong to the same universality class and allows us to estimate the scaling-correction exponent omega related to the leading irrelevant operator, omega=1.0(1). We also determine the critical exponents nu and eta. Taking into account the scaling corrections, we obtain nu=2.53(8) and eta=-0.384(9).