MAGNETIZATION AND INTRAGRANULAR CRITICAL CURRENT DENSITY IN Yb1Ba2Cu3O7−x HIGH TEMPERATURE SUPERCONDUCTOR

The Yb1Ba2Cu3O7−x samples have been prepared by the solid state reaction using the appropriate amount of Yb2O3, BaCO3, and CuO powders and characterized them using X-ray diffraction and electrical resistivity techniques. The X-ray diffraction pattern of the sample shows an orthorhombic structure refined in the space group Pmmm. The critical current densities are calculated from magnetization measurements over a temperature range 77 K to 86 K, and in magnetic fields up to 2 KOe. The intragrain critical current density is estimated to range from 5.24 × 106 (A/cm2) at an applied field of 0.2 KOe to 1.01 × 106 (A/cm2) at an applied field of 2 KOe at T = 77 K in this sample.