Current transfer in HTSC and at high pressures

The authors have measured the pressure effects on the superconducting T c and the current density I c of the YBaCuO (123) phase and the BiSrCaCuO (2223) phase up to 10 kbar. They have found that for Bi ceramics the increase in J c with pressure is related to the T c change, while for YBCO it is due to the Josephson medium weak-link effects. This result provides the evidence that in Bi compounds strong-current Josephson contacts are possible. The influence of high magnetic fields on the Josephson critical current is briefly discussed.