Abstract
The critical behavior of the d = 3 random-field Ising model (RFIM) system Fe x Zn 1- x F 2 is reviewed and compared with recent theories. An equilibrium boundary is found at T eq( H) > T c( H), the sharp phase transition; hysteresis occurs for T < T eq( H). In the d = 2 RFIM system Rb 2Co 0.085Mg 0.15F 4, freezing occurs at a boundary T F (H) < “T c(H)” , the destroyed phase transition. Both T eq( H) and T F( H) follow RFIM crossover scaling.
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