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| VOLUME 90 (2009) | ISSUE 5 | PAGE 408 |
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Unusually strong coherent response from grain-boundary Josephson network in polycrystalline PrxY1-xBa2Cu3O7-δ
V. A. G. Rivera+, S. Sergeenkov+, C. Stari+*, L. Jr. Cichetto+, C. A. Cardoso+, E. Marega∇, F. M. Araujo-Moreira+
+Departamento de Física e Engenharia Física, Grupo de Materiais e Dispositivos, Centro Multidisciplinar para o Desenvolvimento de Materiais Cerâmicos, Universidade Federal de S  o Carlos, 13565-905 So Carlos, SP Brazil*Instituto de Física, Facultad de Ingenieria, Julio Herrera y Reissig 565, C.C. 30, 11000, Montevideo, Uruguay ∇Instituto de Física, USP, 13560-970 S o Carlos, SP, Brazil
PACS: 74.25.Ha, 74.50.+r, 74.62.Dh
Abstract
By applying a highly sensitive homemade AC susceptibility technique to PrxY1-xBa2Cu3O7-δ polycrystals (with x=0.0, 0.1 and 0.3), we observed very sharp Fraunhofer type low-field periodic oscillations of the real part of the AC susceptibility which were attributed to Josephson vortices penetrating intergranular regions of grain-boundary Josephson network in our samples. Assuming the Lorentz type distribution of single-junction contact areas, we were able to successfully fit the experimental data. |