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# Manifestation of geometric resonance in current dependence of AC susceptibility for unshunted array of Nb-AlOx-Nb Josephson junctions

Instituto de Física de São Carlos, USP, Caixa Postal 369, 13560-970, São Carlos, SP, Brazil; Grupo de Materiais e Dispositivos, Departamento de Física, UFSCar, Caixa Postal 676, 13565-905, São Carlos, SP, Brazil

Physica C Superconductivity (Impact Factor: 0.72). 08/2010; 470:1946. DOI: 10.1016/j.physc.2010.08.002 Source: arXiv

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**ABSTRACT:**Results on the temperature and magnetic field dependence of current-voltage characteristics (CVC) are presented for SNS-type 2D ordered array of Nb-Cu0.95Al0.05-Nb junctions. The critical current I-C(T, H) and the power exponent a(T, H) = 1 + phi I-0(C)(T, H)/2k(B)T of the nonlinear CVC law V = R[I-I-C(T,H)](a(T,H)) are found to have a maximum at non-zero value of applied magnetic field H-p = 225 Oe, which is attributed to manifestation of pi-type Josephson contacts in our sample. (C) 2009 Elsevier B.V. All rights reserved.Physics Letters A 01/2009; 374(2):376-379. · 1.77 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**In this paper, we report on different phenomena related to the magnetic properties of artificially prepared highly ordered (periodic) two-dimensional Josephson junction arrays (2D-JJA) of both shunted and unshunted Nb-AlOx-Nb tunnel junctions. By employing mutual-inductance measurements and using a high-sensitive bridge, we have thoroughly investigated (both experimentally and theoretically) the temperature and magnetic field dependence of complex AC susceptibility of 2D-JJA. We also demonstrate the use of the scanning SQUID microscope for imaging the local flux distribution within our unshunted arrays.Superconductor Science and Technology 03/2008; 21:045002. · 2.76 Impact Factor

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