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

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

2003-09-02

arxiv.org/abs/cond-mat/0309055v3

Phys. Rev. Lett. 93, 216805 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.93.216805

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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