Preparation and characterisation of PbSr(YCa)CuO superconducting crystals

Abstract

Basic magnetic properties of Pb2Sr2Y1-xCaxCu3O8+ delta have been studied. Results of the measurements of the AC susceptibility of the powder samples with x=0.2-0.8 and DC magnetic moment and susceptibility of the Pb2Sr2Y0.7Ca0.3Cu3O8+ delta single crystal are presented. Temperature dependence of the magnetic moment in various cooling procedures was measured. Zero-field cooling (ZFC), field cooling (FC) and remanent (REM) magnetic moments are given. A lower critical field Hc1 has been determined for the magnetic field oriented perpendicular (Hperpendicular to ) and parallel to (H/sub ///) to the Cu-O planes. A new more sensitive procedure of Hc1 determination has been proposed.