Abstract
Thermoremanent magnetization (TRM), isothermoremanent magnetization (IRM) and time dependence of IRM have been investigated in powders and ceramics of YBa 2Cu 3O 7−δ in low magnetic fields. Measurements of TRM of powders with different particle sizes show trapping of single flux quanta in microcrystals. Time dependence of IRM for powders and ceramics shows the difference in dynamics of vortices when there were present in the sample only Abrikosov vortices or both Abrikosov and Josephson vortices, respectively. Also a reversible temperature dependence of the remanent magnetization, observed only in powders but not in ceramics, is reported. This reversibility is explained by the increase of the penetration depth λ when the temperature of the sample is lowered.
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