Transport currents along c-axis and ( a,b) planes in YBCO single domain materials. Critical current densities and normal-superconducting transitions

Abstract

High transport currents along the ( a,b) planes and along the c-axis have been measured in pulsed current of different pseudo-frequencies. Self field losses and transport current of 8000 A (20000 A cm −2) have been measured in Y 1Ba 2Cu 3O 7- δ bars textured by the melting zone technique. Critical currents as high as 500 A (90000 A cm −2) along the ( a,b) planes or 3000 A (7500 A cm −2) along the c-axis have been measured. For both orientations, the transition from the normal state to the superconducting state has been observed. Electric field of 1000 V m −1 and study of the superconducting state recovery are reported.