Weak link problem and intragrain current density in polycrystalline Bi1Ca1Sr1Cu2Ox and Tl2Ca2Ba2Cu3O10 |
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| Authors: | H Küpfer S M Green C Jiang Yu Mei H L Luo R Meier-Hirmer C Politis |
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| Institution: | (1) Kernforschungszentrum Karlsruhe, Institut für Technische Physik und Universität Karlsruhe, Postfach 3640, D-7500 Karlsruhe 1, Federal Republic of Germany;(2) Department of Electrical and Computer Engineering, University of California, San Diego, Mail Code C-014, 92093 La Jolla, Calif., USA;(3) Kernforschungszentrum Karlsruhe, Institut für Nukleare Festkörperphysik, Postfach 3640, D-7500 Karlsruhe 1, Federal Republic of Germany |
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| Abstract: | Polycrystalline sintered specimen were investigated by means of ac susceptibility and inductive critical current measurements. Main objects are whether the new highT
c
oxides have a weakly coupled intergranular structure and to get information about the intragrain critical current density. The Tl2Ca2Ba2Cu3O10 specimen shows a connective nature similar to YBa2Cu3O7 with low intergrain currents (100 A/cm2 at 100K,B=0 T) and high intragrain ones (4.5·105 A/cm2 at 100K,B=0 T). The investigation of the Bi1Ca1Sr1Cu2Ox specimen becomes complex due to the presence of two superconducting phases and the low intragrain critical current density of the lowerT
c
phase. |
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