Abstract
Flux creep due to the motion of macroscopic quantum excitations is decribed with a macroscopic approach. The quantities characterizing the flux creep, calculated by means of the presented theory, have the same order of magnitude as those extracted from experiments. The dependence of the magnetic moment relaxation rate on time, temperature, and magnetic field is derived and compared with experimental data. The nonlinear dependence of the magnetic moment on the logarithm of time is obtained. The characteristic energy barrier depends very strongly on the magnetic field penetration depth and can become small even away from the critical temperature. The finiteness of the sample causes the linear dependence of the electric field on the current density (Ohm’s law) for sufficiently small current densities.
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