Sub-gap conductance in ferromagnetic-superconducting mesoscopic structures

Details Sub-gap conductance in ferromagnetic-superconducting mesoscopic structures Sub-gap conductance in ferromagnetic-superconducting mesoscopic structures

1998-11-09

arxiv.org/abs/cond-mat/9811117v1

Phys. Rev. B 59, 12264 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages revtex

Scientific paper

10.1103/PhysRevB.59.12264

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 $r= \gamma / \epsilon_T$ 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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