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Sub-gap conductance in ferromagnetic-superconducting mesoscopic structures

M. Leadbeater·C. J. Lambert·R. Raimondi·A. F. Volkov
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Abstract

We study the sub-gap conductance of a ferromagnetic mesoscopic region attached to a ferromagnetic and a superconducting electrode by means of tunnel junctions. In the absence of the exchange field, the ratio $r= γ/ ε_T$ of the two tunnel junction resistances determines the behaviour of the sub-gap conductance which possesses a zero-bias peak for $r\gg 1$ and for $r\ll 1$ a peak at finite voltage. We show that the inclusion of the exchange field leads to a peak splitting for $r\ll 1$, while it shifts the zero-bias anomaly to finite voltages for $r\gg 1$.

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M. Leadbeater, C. J. Lambert, R. Raimondi, A. F. Volkov. 1998-11-09. Sub-gap conductance in ferromagnetic-superconducting mesoscopic structures. https://doi.org/10.1103/physrevb.59.12264

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