V. Rivera, S. Sergeenkov, С. Stari, L. J. Cichetto, C. A. Cardoso, E. Marega, F. M. Araujo-Moreira, “Unusually strong coherent response from grain-boundary Josephson network in polycrystalline Pr$_x$Y$_{1-x}$Ba$_2$Cu$_3$O$_{7-\delta}$”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2009, Volume 90, Issue 5,Pages 408

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CONDENSED MATTER

Unusually strong coherent response from grain-boundary Josephson network in polycrystalline Pr$_x$Y$_{1-x}$Ba$_2$Cu$_3$O$_{7-\delta}$

V. Rivera^a, S. Sergeenkov^a, С. Stari^ab, L. J. Cichetto^a, C. A. Cardoso^a, E. Marega^c, F. M. Araujo-Moreira^a

^a Departamento de Física e Engenharia Física, Grupo de Materiais e Dispositivos,Centro Multidisciplinar para o Desenvolvimento de Materiais Cerâmicos,Universidade Federal de São Carlos, 13565-905 São Carlos, SP Brazil
^b Instituto de Física, Facultad de Ingenieria, Julio Herrera y Reissig 565, C.C. 30, 11000, Montevideo, Uruguay
^c Instituto de Física, USP, 13560-970 São Carlos, SP, Brazil

Abstract: By applying a highly sensitive homemade AC susceptibility technique to Pr$_x$Y$_{1-x}$Ba$_2$Cu$_3$O$_{7-\delta}$ 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.

PACS: 74.25.Ha, 74.50.+r, 74.62.Dh

Received: 23.06.2009
Revised: 23.07.2009

Language: English