Hysteretic and AC losses of high T(sub c) superconductors by numerical solution of the nonlinear magnetic diffusion equation

摘要

The complex AC susceptibility ((chi)) of high T(sub c) superconducting materials has been described in terms of hysteretic and AC losses. By including both flux creep and flux flow resistivities in the expression of the flux diffusivity, induction profiles have been numerically calculated from the non linear flux diffusion equation. The imaginary part of (chi) has been evaluated as function of temperature, frequency and amplitude of the applied magnetic field. The role of pinning and AC losses occurring in high T(sub c) materials is discussed.