Transport Properties of Silver Sheathed BSCCO-2223 Tapes in High Magnetic Fields

This paper is the first report of our work on HTSC tapes which started only several month ago. Critical current densities of 17 000 A/cm2 were achieved in short samples of Bi-2223/Ag tapes prepared by the powder-in-tube technique. The critical current and I/U-characteristics have been studied in magnetic field up to 8 T and at different temperatures between 4.2 K and 77 K. Close to 77 K and in fields up to 1 T the critical current density is strongly field dependend and obeys a potential law. At lower temperatures a quite different behavior is observed. A new setup for the routine determination of the AC-susceptibility of the tapes is presented.