INSTITUTE OF PHYSICS PUBLISHING SUPERCONDUCTOR SCIENCE AND TECHNOLOGY.pdf

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INSTITUTE OF PHYSICS PUBLISHING SUPERCONDUCTOR SCIENCE AND TECHNOLOGY.pdf

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INSTITUTE OF PHYSICS PUBLISHING SUPERCONDUCTOR SCIENCE AND TECHNOLOGY

INSTITUTE OF PHYSICS PUBLISHING SUPERCONDUCTOR SCIENCE AND TECHNOLOGY Supercond. Sci. Technol. 17 (2004) 1283–1288 PII: S0953-2048(04)79305-7 The identification of grain boundary networks of distinct critical current density in YBa2Cu3O7?x coated conductors T Puig1, A Palau1, X Obradors1, E Pardo2, C Navau2,3, A Sanchez3, Ch Jooss4, K Guth4 and H C Freyhardt4 1 Institut de Cie?ncia de Materials de Barcelona, CSIC, Campus de la UAB, 08193 Bellaterra, Spain 2 Grup d’Electromagnetisme, Departamento de F??sica, Universitat Auto?noma de Barcelona, 08193 Bellaterra, Spain 3 Escola Universitaria Salesiana de Sarria?, Passeig Sant Joan Bosco 74, 08017 Barcelona, Spain 4 Institut fu?r Materialphysik, University of Go?ttingen, D: 37073 Go?ttingen, Germany Received 7 April 2004 Published 18 August 2004 Online at stacks.iop.org/SUST/17/1283 doi:10.1088/0953-2048/17/11/008 Abstract Evidence for the existence of grain boundary (GB) networks with different critical current densities has been obtained in YBa2Cu3O7?x coated conductor tapes, through distinct magnetic responses in AC susceptibility measurements. Percolating currents through GB networks of different quality may be distinguished by the appearance of modified dissipation contributions in the imaginary component of the AC susceptibility. The application of the Bean critical-state model to the AC susceptibility response of finite size samples has allowed us to properly quantify these critical current densities. AC susceptibility appears as a unique direct measurement of the temperature-dependent intergrain critical current densities with additional information about the current networks, which cannot be reached by transport measurements. 1. Introduction Coated conductors are an interesting new class of superconductors with high critical currents where new physics on current-percolation phenomena and vortex-pinning effects are encountered. Transport critical current measurements and V (I) characteristics have demonstrated t