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Resonant transmission of normal electrons through Andreev states in ferromagnets

A. Kadigrobov·R. I. Shekhter·M. Jonson·Z. Ivanov·T. Claeson
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Abstract

Giant oscillations of the conductance of a superconductor - ferromagnet - superconductor Andreev interferometer are predicted. The effect is due to the resonant transmission of normal electrons through Andreev levels when the voltage $V$ applied to the ferromagnet is close to $2h_0/e$ ($h_0$ is the spin-dependant part of the electron energy). The effect of bias voltage and phase difference between the superconductors on the current and the differential conductance is presented. These efects allow a direct spectroscopy of Andreev levels in the ferromagnet.

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A. Kadigrobov, R. I. Shekhter, M. Jonson, Z. Ivanov, T. Claeson. 1999-01-26. Resonant transmission of normal electrons through Andreev states in ferromagnets. https://doi.org/10.1103/physrevb.60.14593

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