Abstract
The real and imaginary parts of the dynamic linear magnetic susceptibility at very low temperatures are found within the quantum droplet model of Ising spin glass, and their temperature and frequency dependences are calculated analytically and numerically. The nonequilibrium theory of the response of quantum-mechanical systems is used. The slow, quasi-equilibrium dynamics and the divergence of the dynamic linear susceptibility are investigated. Numerical calculations illustrate the crossover between the low-frequency and high-frequency regimes. A transition to the glasslike state is assumed to occur at a nonzero temperature. At zero temperature, the results are identical to those obtained earlier. The spin-glass ageing is considered briefly in the model at hand.
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