Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1997-08-07
Physics
Condensed Matter
Disordered Systems and Neural Networks
10 pages, 2 figures, Latex
Scientific paper
10.1088/0305-4470/31/16/005
We study numerically the region above the critical temperature of the four dimensional Random Field Ising Model. Using a cluster dynamic we measure the connected and disconnected magnetic susceptibility and the connected and disconnected overlap susceptibility. We use a bimodal distribution of the field with $ h_R=0.35T $ for all temperatures and a lattice size L=16. Through a least-square fit we determine the critical exponents $ \gamma $ and $ \bar{\gamma} $. We find the magnetic susceptibility and the overlap susceptibility diverge at two different temperatures. This is coherent with the existence of a glassy phase above $ T_c $. Accordingly with other simulations we find $ \bar{\gamma}=2\gamma $. In this case we have a scaling theory with two indipendet critical exponents
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