Subgap conductance in ferromagnet-superconductor mesoscopic structures
M. Leadbeater, C. J. Lambert, K. E. Nagaev, R. Raimondi, A. F. Volkov
DOI 10.1103/PhysRevB.59.12264 · Physical Review B
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Abstract
We study the subgap 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/εT of the two-tunnel junction resistances determines the behavior of the subgap conductance, which possesses a zero-bias peak for r≫1 and for r≪1 a peak at finite voltage. We show that the inclusion of the exchange field leads to a peak splitting for r≪1, while it shifts the zero-bias anomaly to finite voltages for r≫1.
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