Abstract.
Crossed Andreev reflections and cotunneling occur between two neighbouring superconductor- normal metal or superconducting-ferromagnet interfaces. Previous works assumed a clean BCS superconductor. Here the calculation of the corresponding crossed conductance terms is generalized to a dirty superconductor. The range of the effect is shown to be the coherence length \(\tilde{\xi} = \sqrt{\hbar D/\Delta}\), instead of the BCS coherence length \(\xi_0\). Moreover, in three dimensions, the algebraic prefactor scales as 1/r instead of 1/r 2. The calculation involves the virtual diffusion probability of quasiparticles below the superconducting gap, in the normal and the anomalous channel.
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Received: 10 October 2003, Published online: 23 December 2003
PACS:
74.45. + c Proximity effects; Andreev effect; SN and SNS junctions - 73.63.Rt Nanoscale contacts - 74.78.-w Superconducting films and low-dimensional structures
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Feinberg, D. Andreev scattering and cotunneling between two superconductor-normal metal interfaces: the dirty limit. Eur. Phys. J. B 36, 419–422 (2003). https://doi.org/10.1140/epjb/e2003-00361-6
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DOI: https://doi.org/10.1140/epjb/e2003-00361-6