FIZIKA A 2 (1993) 2, 89-100

SUPERCONDUCTING PROPERTIES OF AN Ag-CLAD (BiPb)2Sr2Ca2Cu3O10+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 Js (from ac susceptibility) is 30000 A/cm2 at 77 K whereas the transport critical current density Jc (from V-I curves) is 10100 A/cm2 at the same temperature. Both Js and Jc showed power law variations with T and B, respectively, characteristic for intragranular flux creep. From the dissipation within the core the differential resistance Rf (associated with the flux flow) has been deduced. The magnitude and the variations of Rf 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 Jc within the core is Jcp @ 2.4Jc and the maximum one Jcm @ 5Jc. Such large Jcm enables further improvement of Jc in Ag-BPSCCO tapes.

UDC 538.945

 

 

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