Abstract
The Anderson–Kim model is employed to calculate the temperature and AC magnetic field dependence of the complex susceptibility, χ= χ ′+i χ ′′, of high T c superconductor Tl 0.8Pb 0.2Bi 0.2Sr 1.6Ba 0.4Ca 2Cu 3O x . Intergranular Josephson vortices sweep in and out of the weak-link network, while intragranular Abrikosov vortices move in and out of the superconducting grains, both causing bulk pinning hysteresis loss. The calculated χ ′ and χ ′′ are consistent with experimental data very well by considering the proper volume fraction of superconducting grains and intergranular region. Using field dependence of critical current density obtained from fitting parameter, the property of intergranular region is discussed and the intergranular lower critical field H c1J is determined.
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