Spin-glass transition in a magnetic field

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Abstract
In vector spin glasses this transition is associated with the freezing of transverse degrees of freedom. However, weak random anisotropy may induce a cross-over to Ising behaviour if it is sufficiently strong compared to the magnetic field. In two-dimensional systems with short-range forces, and perhaps in three-dimensional systems as well, the spin-glass transition occurs only at T = 0. The effect of magnetic fields on the zero-temperature transition is briefly discussed. Experimentally, spin-glass behaviour does seem to occur in the presence of magnetic fields below a critical temperature T c(H). Possible interpretations of the experimental results are summarized.