Abstract
The results of intergrain magnetization calculations in high-temperature superconductors in a critical state model with the generalized expression for the critical current density Jc= alpha 0(1-T/Tc)q/(B0+ mod B mod )beta are presented. The temperature and field dependent local fields, magnetic loops and ac susceptibility have been calculated. The procedure of determining parameters of pinning centres is also discussed. The experimental data of temperature dependences of fundamental ac susceptibility measured with various ac field amplitudes are compared with the calculated ones for a ceramic sample of YBa2Cu3O7- delta .
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