Logarithmic dynamic scaling in spin-glasses

Evidence is presented that "freezing" in spin-glasses is a consequence of anomalous critical slowing down associated with a zero-temperature transition: temperature and field dependences of the relaxation time are compatible with lnT^-f (HT^-) both for nearest-neighbor J-Ising models and Eu₀. ₄Sr₀. ₆S. The exponents, z, and are estimated. Also, the nonlinear susceptibility of Cu Mu 1% is shown to be very similar to that of the d=3, model, compatible with our description.