Abstract
The temperature and size dependences of critical current in three Bi-based ceramic HTSC samples with a circular cross section and in a sample with a right triangular cross section in zero magnetic field are studied by a contactless technique. It is shown that the critical current of ceramic HTSC can be presented as the product of the temperature- and size-dependent factors. The temperature-dependent factor describes individual properties of the Josephson net of each sample, while the size-dependent factor is a homogeneous function whose exponent does not depend on the shape of the sample cross section. An analysis of experimental data is used to find the radial distribution of critical current density in round samples and to determine its dependence on the magnetic induction in granular HTSC.
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