Relaxation of the magnetization in the pinning state of high-Tc superconductors

Abstract As one of the bases of the theoretical estimation of the electromagnetic properties for practical purposes in wires, conductors and coils using high- T c cuprate superconductors, the expression for the time decay of the magnetization in a slab sample of the high- T c cuprate superconductor is derived by solving the Maxwell equations with the aid of the expression for the electric field, E , vs. current density, J , characteristic that was derived recently by the authors. The obtained expression, which is noticeably different from the one for the low- T c metallic superconductors, is compared quantitatively with the numerical calculations, and the agreement between them seems to be satisfactory.