The immutability of the critical current under any sample cross-sectional form modification |
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Authors: | NA Bogolyubov |
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Institution: | Institute of Inorganic Chemistry Russian Academy of Sciences, Siberian Branch, Lavrent'eva 3, Novosibirsk 630090, Russia |
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Abstract: | The temperature and size dependences of the critical currents in bismuth-based high-temperature superconducting ceramic samples consisting of randomly oriented grains have been studied in zero magnetic field. It is shown that the critical current is a function of the sample cross-sectional area only. At constant sample cross-sectional area the value of the critical current is independent of any variation of a sample cross-sectional shape. At the same time the distributions of the critical current density and induced magnetic field in ceramics are functions of the sample cross-sectional shape. These values very in accordance with a change of the sample cross-sectional shape (at constant cross-sectional area i.e. at constant value of the critical current). The field and current distributions in the rectangular sample are reported. |
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Keywords: | 74 25 Sv 74 72 Hs 74 81 Bd |
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