Magnetization of granular high-T{sub c} superconductors in strong magnetic fields
The remagnetization processes occurring in ceramic oxide superconductors in strong magnetic fields have been studied experimentally and theoretically. A model of the critical state, which makes it possible to take into account the granular structure of ceramic high-T{sub c} superconductors, has been developed to interpret the experimental results. Equations describing the hysteresis loops of granular materials in strong magnetic fields have been derived for an arbitrary dependence of the critical current density on the magnetic induction. It has been established for the high-T{sub c} superconductors investigated that the function j{sub c}(B) is characterized by the existence of two scaling parameters B{sub o} and B{sub 1}, which distinguish regions with different rates of decrease of j{sub c}. The proposed form of j{sub c}(B) yields quantitative agreement between the experimental and theoretical hysteresis loops. The behavior of j{sub c}(B) thus obtained is in good agreement with that previously found in fields up to 5 kOe. 18 refs., 4 figs.
- OSTI ID:
- 181959
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 107, Issue 4; Other Information: PBD: Apr 1995; TN: Translated from Zhurnal Eksperimental`noi i Teoreticheskoi Fiziki; 107: No. 4, 1221-1231(Apr 1995)
- Country of Publication:
- United States
- Language:
- English
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