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We present a magnetization study of low density YBCO ceramics carried out inmagnetic fields 0.5 Oe < H < 50 kOe. It was demonstrated that superconductinglinks between grains may be completely suppressed either by a magnetic field ofthe order of 100 Oe (at low temperatures) or by an increase of temperatureabove 70 K. This property of present samples allowed to evaluate the ratiobetween an average grain size and the magnetic field penetration depth lambda.Furthermore, at temperatures T > 85 K, using low-field magnetizationmeasurements, we could evaluate the temperature dependence of lambda, whichturned out to be very close to predictions of the conventional Ginzburg-Landautheory. Although present samples consisted of randomly oriented grains,specifics of magnetization measurements allowed for evaluation of lambda_ab(T).Good agreement between our estimation of the grain size with the real samplestructure provides evidence for the validity of this analysis of magnetizationdata. Measurements of equilibrium magnetization in high magnetic fields wereused for evaluation of Hc2(T). At temperatures close to T_c, the Hc2(T)dependence turned out to be linear in agreement with the Ginzburg-Landautheory. The value of temperature, at which Hc2 vanishes, coincides with thesuperconducting critical temperature evaluated from low-field measurements.

Detailed magnetization study of superconducting properties of YBCO ceramic spheres