Superconducting crossed correlations in ferromagnets: implications for thermodynamics and quantum transport

Details Superconducting crossed correlations in ferromagnets: implications for thermodynamics and quantum transport Superconducting crossed correlations in ferromagnets: implications for thermodynamics and quantum transport

2000-10-31

arxiv.org/abs/cond-mat/0010490v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, RevTex

Scientific paper

10.1088/0953-8984/13/30/301

It is demonstrated that non local Cooper pairs can propagate in ferromagnetic electrodes having an opposite spin orientation. In the presence of such crossed correlations, the superconducting gap is found to depend explicitly on the relative orientation of the ferromagnetic electrodes. Non local Cooper pairs can in principle be probed with dc-transport. With two ferromagnetic electrodes, we propose a ``quantum switch'' that can be used to detect correlated pairs of electrons. With three or more ferromagnetic electrodes, the Cooper pair-like state is a linear superposition of Cooper pairs which could be detected in dc-transport. The effect also induces an enhancement of the ferromagnetic proximity effect on the basis of crossed superconducting correlations propagating along domain walls.

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