The critical state of thin SQUID arrays
Instituto de Magnetismo Aplicado, RENFE-UCM, 28230 Las Rozas,
2 Grup d'Electromagnetisme, Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
Accepted: 12 December 1997
The current and field profiles are calculated for a thin SQUID array as functions of the normalized maximum Josephson current imax and the perpendicularly applied field. In comparison with the SQUID array treated earlier without considering demagnetizing effects, the same transition from the vortex state to the critical state is found with increasing imax, but the rational normalized critical current ic is now multiplied by a prefactor varying with the array dimensions. These results further confirm the intergranular critical state in granular bulk high-Tc superconductors to arise at sufficiently large junction currents and provide a case where theoretical results can be checked by experiments.
PACS: 74.50.r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.25.Ha – Magnetic properties / 74.60.Jg – Critical currents
© EDP Sciences, 1998