Superconducting cross-correlations in ferromagnets: implications for thermodynamics and quantum transport

Author: Mlin R.

Source: Journal of Physics: Condensed Matter, Volume 13, Number 30, 2001 , pp. 6445-6451(7)

Publisher: Institute of Physics Publishing

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Abstract:

It is demonstrated that non-local Cooper pairs can propagate in ferromagnetic electrodes with opposite spin orientations. In the presence of such cross-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 by means of direct-current (dc) transport. For two ferromagnetic electrodes, we propose a `quantum switch' that can be used to detect correlated pairs of electrons. For three or more ferromagnetic electrodes, the Cooper pair-like state is a linear superposition of Cooper pairs which could be detected in the dc transport. The effect also induces an enhancement of the ferromagnetic proximity effect on the basis of superconducting cross-correlations propagating along domain walls.

Language: English

Document Type: Miscellaneous

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