FIZIKA A 2 (1993) 2, 89-100

SUPERCONDUCTING PROPERTIES OF AN Ag-CLAD (BiPb)₂Sr₂Ca₂Cu₃O_10+y TAPE

IVICA KUŠEVIĆ, EMIL BABIĆ
Department of Physics, The University of Zagreb, POBox 162, 41001 Zagreb, Croatia
ŽELJKO MAROHNIĆ, ĐURO DROBAC, MLADEN PRESTER
Institute of Physics of the University, POBox 304, 41001 Zagreb, Croatia
and
H.K. LIU, S.X. DOU
School of Material Science and Engineering, University of New South Wales,
POBox 1, Kensington, NSW 2033, Australia

Received 15 April 1993

Original scientific paper

AC susceptibility and V-I characteristics of a well characterised Ag-clad Bi-Pb-Sr-Ca-Cu-O tape have been studied in the temperature (T) range 77-106 K and magnetic fields (B) up to 0.06 T. The intrinsic critical current density J_s (from ac susceptibility) is 30000 A/cm² at 77 K whereas the transport critical current density J_c (from V-I curves) is 10100 A/cm² at the same temperature. Both J_s and J_c showed power law variations with T and B, respectively, characteristic for intragranular flux creep. From the dissipation within the core the differential resistance R_f (associated with the flux flow) has been deduced. The magnitude and the variations of R_f with T and B are consistent with those due to flux flow in type II superconductors in low field. From d² V/d I² vs I curves very broad critical current distribution CCD has been deduced. The most probable J_c within the core is J_cp @ 2.4J_c and the maximum one J_cm @ 5J_c. Such large J_cm enables further improvement of J_c in Ag-BPSCCO tapes.

UDC 538.945

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