Abstract
A method for the accurate determination of bulk critical currents (Js) of high temperature superconductors (HTS) via high resolution ac susceptibility measurements is described. It is based on the critical-state model, but its results, unlike those obtained from other methods (e.g. magnetization hysteresis or voltage versus transport current, i.e. V-I curves), are free from the effects of trapped field or self-field, thus it yields the true Js(H) and Js(T) variations. This method is employed for the determination of the Js vs H variation at 78K in a YBa2Cu3O7−x ceramic sample. Furthermore, the applicability of the critical-state model to the investigation of Js in sintered HTS samples has been verified over a wide range of applied magnetic fields (H<4,400A/m). Interesting effects occuring as a consequence of the partial cancellation of dc and ac magnetic fields acting on a sample have been observed. The importance of this method for the investigation of the strength and nature of the intergrain coupling in ceramic HTS samples is briefly disscused.
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Marohnić, Ž., Babić, E. (1991). Critical Current Densities from ac Susceptibility Data. In: Hein, R.A., Francavilla, T.L., Liebenberg, D.H. (eds) Magnetic Susceptibility of Superconductors and Other Spin Systems. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2379-0_13
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DOI: https://doi.org/10.1007/978-1-4899-2379-0_13
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