Temperature Dependence of Irreversible Magnetization
in a Granular Superconductor

E. E. Kokorina and M. V. Medvedev

Institute of Electrophysics, Ural Division, Russian Academy of Sciences,
ul. Komsomol’skaya 34, Ekaterinburg, 620219 Russia

Received June 21, 1995; in final form, July 28, 1995

Abstract—The differences in the temperature dependences of irreversible magnetization of a granular super-
conductor cooled in zero magnetic field (ZFC magnetization) and in a finite magnetic field (FC magnetization)
and the temperature dependence of the remanent magnetization (REM magnetization) were studied theoreti-
cally. Particular attention was paid to the effects of weak intergranular critical currents, which play an important
role in the temperature range 0 < T < T_irr,m where the phenomena of intergranular irreversibility develop (the
upper boundary of this temperature range lies below the upper boundary T_irr,g of the temperature range for the
phenomena of intragranular irreversibility). It is shown that, as compared to the case of a homogeneous super-
conductor, the intergranular critical currents in a granular superconductor give additional contributions to the
curves of ZFC and remanent magnetization in the temperature range 0 < T < T_irr,m.

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