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Subgap conductance in ferromagnet-superconductor mesoscopic structures

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<mark>Journal publication date</mark>15/05/1999
<mark>Journal</mark>Physical Review B
Issue number19
Number of pages4
Pages (from-to)12264-12267
<mark>Original language</mark>English


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 = gamma/epsilon(T) Of the two-tunnel junction resistances determines the behavior of the subgap conductance, which possesses a zero-bias peak for r much greater than 1 and for r much less than 1 a peak at finite voltage. We show that the inclusion of the exchange field leads to a peak splitting for r much less than 1, while it shifts the zero-bias anomaly to finite voltages for r much greater than 1.