Multiple Andreev Reflections in Weak Links of Superfluid 3He-B

Details Multiple Andreev Reflections in Weak Links of Superfluid 3He-B Multiple Andreev Reflections in Weak Links of Superfluid 3He-B

2004-08-19

arxiv.org/abs/cond-mat/0408430v1

Phys. Rev. B 71, 064509 (2005)

Physics

Condensed Matter

Superconductivity

12 pages, 9 figures, RevTeX4

Scientific paper

10.1103/PhysRevB.71.064509

We calculate the current-pressure characteristics of a ballistic pinhole aperture between two volumes of B-phase superfluid 3He. The most important mechanism contributing to dissipative currents in weak links of this type is the process of multiple Andreev reflections. At low biases this process is significantly affected by relaxation due to inelastic quasiparticle-quasiparticle collisions. In the numerical calculations, suppression of the superfluid order parameter at surfaces is taken into account self-consistently. When this effect is neglected, the theory may be developed analytically like in the case of s-wave superconductors. A comparison with experimental results is presented.

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