Characterization of the High-Tc Superconductor Y-Ba-Cu Oxide –Critical Current and Crystal Structure–

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Abstract
Critical currents are measured in the title material. At 9.5 K, where an apparent resistance is zero, the critical-current density J c is found to be about 1.7 A/cm2 in a sintered sample. For currents smaller than J c the sample resistivity is less than 2.3 µΩ·cm. By X-ray diffraction the crystal structure is found to be essentially of a perovskite type. Its unit cell composed of eight units of the perovskite structure has a face-centered tetragonal symmetry with the lattice parameters a=b=7.83±0.02 Å and c=7.72±0.03 Å.

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