Journal
EUROPEAN PHYSICAL JOURNAL B
Volume 36, Issue 3, Pages 419-422Publisher
SPRINGER-VERLAG
DOI: 10.1140/epjb/e2003-00361-6
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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 (ξ) over tilde = root(h) over barD/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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