Intergranular Critical Current Density in Polycrystalline (Bi-Pb)-2223 High Temperature Superconductor by ac Susceptibility Measurements |
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Authors: | A Ray T K Dey and S K Ghatak |
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Affiliation: | (1) Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur, 721 302, India;(2) Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur, 721 302, India |
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Abstract: | The field dependence of real (![chi](/content/k448t3evm63xk0xu/xxlarge967.gif) ) and imaginary (![chi](/content/k448t3evm63xk0xu/xxlarge967.gif) ) component of ac susceptibility of superconductors within the critical state model can conveniently be used for evaluating the critical current when field amplitude is larger than the penetration field. A method to analyze the real (![chi](/content/k448t3evm63xk0xu/xxlarge967.gif) ) and imaginary (![chi](/content/k448t3evm63xk0xu/xxlarge967.gif) ) component of fundamental ac susceptibility with the objective of extracting the temperature dependence of critical current density J
c(T) is reported. The procedure makes use of the ac susceptibility data of two polycrystalline (Bi-Pb)-2223 samples measured with different excitation amplitudes below and close to the critical temperature. The temperature dependence of J
c is extracted using the isothermal scan over ![chi](/content/k448t3evm63xk0xu/xxlarge967.gif) and ![chi](/content/k448t3evm63xk0xu/xxlarge967.gif) data. Results obtained from this procedure are found to be in fair agreement with J
c(T) calculated from traditional loss-maximum data. |
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Keywords: | ac susceptibility (Bi-Pb)-2223 superconductors current density critical state model |
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