Temperature-induced coexistence of integer, half-integer and quarter-integer fluxoid configurations in d-wave SQUIDs with a ferromagnetic junction

We consider SQUIDs containing a 0 deg -45 deg d-wave (D) Josephson junction with tunneling in the a-b plane through a thin ferromagnetic (F) barrier. In the clean case and for high barrier transparency, the coexistence of stable 0,pi and metastablepi/2 states in such DFD junctions could give a tempe...

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Bibliographic Details
Published in:Superconductor science & technology 2009-07, Vol.22 (7), p.075022-075022p6
Main Authors: Zikic, R, Dobrosavljević-Grujić, L, Vujičić, B
Format: Article
Language:English
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Summary:We consider SQUIDs containing a 0 deg -45 deg d-wave (D) Josephson junction with tunneling in the a-b plane through a thin ferromagnetic (F) barrier. In the clean case and for high barrier transparency, the coexistence of stable 0,pi and metastablepi/2 states in such DFD junctions could give a temperature-induced coexistence between stable integer, half-integer and quarter-integer fluxoid configurations in SQUIDs. This coexistence may take place in a finite range of barrier thicknesses (for a given value of the exchange field in the ferromagnet), resulting in two (double) flux jumps per one external flux quantum in the diagramPhi(eq)(Phi(e)) of equilibrium flux as a function of external flux. Novel quantum devices can be based on such SQUIDs.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/22/7/075022