Giant fluctuations of superconducting order parameter in Ferromagnet/superconductor single electron transistors

A. Brataas; D. B. Haviland; J. Johansson; V. Korenivski

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Giant fluctuations of superconducting order parameter in Ferromagnet/superconductor single electron transistors

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arxiv cond-mat/0309055 v3 pith:GA6SH4Z5 submitted 2003-09-02 cond-mat.mes-hall

J. Johansson , V. Korenivski , D. B. Haviland , A. Brataas This is my paper · ORCID

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keywords spinferromagnetaccumulationelectronfluctuationssinglesuperconductingsuperconductor

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Spin dependent transport in a ferromagnet/superconductor/ferromagnet single electron transistor is studied theoretically with spin accumulation, spin relaxation, gap suppression, and charging effects taken into account. A strong dependence of the gap on the magnetic state of the outer electrodes is found, which gives rise to a negative magneto-resistance of up to 100 %. We predict that fluctuations of the spin accumulation due to tunneling of quasi-particles can play such an important role as to cause the island to fluctuate between the superconducting

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