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Subgap conductance in ferromagnet-superconductor mesoscopic structures

Research output: Contribution to journalJournal article

Published

Journal publication date15/05/1999
JournalPhysical Review B
Journal number19
Volume59
Number of pages4
Pages12264-12267
Original languageEnglish

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 = 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.