Low-field magnetic response of multi-junction superconducting quantum interference devices

R. De Luca () and A. Fedullo

The European Physical Journal B: Condensed Matter and Complex Systems, 2008, vol. 61, issue 1, 59-66

Abstract: The magnetic states of multi-junction superconducting quantum interference device containing 2N identical conventional Josephson junctions are studied by means of a perturbation analysis of the non-linear first-order ordinary differential equations governing the dynamics of the Josephson junctions in these devices. In the zero-voltage state, persistent currents are calculated in terms of the externally applied magnetic flux Φ ex . The resulting d.c. susceptibility curves show that paramagnetic and diamagnetic states are present, depending on the value of Φ ex . The stability of these states is qualitatively studied by means of the effective potential notion for the system. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Keywords: 74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects, 85.25.Dq Superconducting quantum interference devices (SQUIDs), (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1140/epjb/e2008-00040-2

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