The H-T diagram describing the critical current behaviour of granular superconductors in a magnetic field is proposed. The process of trapping magnetic field by a ceramic sample and the influence of the trapped field on the transport critical current have been studied. T h e temperature and magnetic fieid dependences oi intergrain and iniragrain criiicai currents have been anaiysed.
The peak effect in YBa&Cu30» single crystals is observed by transport-current measurements.Comparison with the shielding current from magnetization shows good agreement between the results, which exclude granularity as being necessarily involved in the origin of the peak effect. The behavior of the current-voltage characteristics in a wide voltage range (10 & E & 10 V/cm) is analyzed. Different types of scaling are established in magnetic fields below and above the position of the current peak. Possible mechanisms responsible for the peak effect are discussed.Studies of magnetic properties of BBagCu307 g single crystals have shown that the dependence of their irreversible magnetization on the magnetic field has a wellpronounced maximum above the self-field region. This phenomenon, often referred to as a "peak, " "fishtail, " or
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