Critical exponents of four-dimensional random-field Ising systems

Abstract

The ferromagnet-to-paramagnet transition of the four-dimensional random-field Ising model with Gaussian distribution of the random fields is studied. Exact ground states of systems with sizes up to 32^4 are obtained using graph theoretical algorithms. The magnetization, the disconnected susceptibility, the susceptibility and a specific heat-like quantity are calculated. Using finite-size scaling techniques, the corresponding critical exponents are obtained: β=0.15(6), γ`=3.12(10), γ=1.57(10) and α=0 (logarithmic divergence). Furthermore, values for the critical randomness h_c=4.18(1) and the correlation-length exponent ν=0.78(10) were found. These independently obtained exponents are compatible with all (hyper-) scaling relations and support the two-exponent scenario (γ`=2γ)