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 1 Ba 2 Cu 3 O 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.