Subharmonic Gap Structure in Superconductor/Ferromagnet/Superconductor Junctions

Details Subharmonic Gap Structure in Superconductor/Ferromagnet/Superconductor Junctions Subharmonic Gap Structure in Superconductor/Ferromagnet/Superconductor Junctions

2005-10-27

arxiv.org/abs/cond-mat/0510733v2

Phys.Rev.B, 73, 012506 (2006)

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure, minor stylistic changes, journal-ref added

Scientific paper

10.1103/PhysRevB.73.012506

The behavior of dc subgap current in magnetic quantum point contact is discussed for the case of low-transparency junction with different tunnel probabilities for spin-up ($D_\uparrow$) and spin-down ($D_\downarrow$) electrons. Due to the presence of Andreev bound states $\pm \epsilon_0$ in the system the positions of subgap electric current steps $eV_n = (\Delta \pm \epsilon_0)/n$ are split at temperature $T \neq 0$ with respect to the nonmagnetic result $eV_n=2\Delta/n$. It is found that under the condition $D_\uparrow \neq D_\downarrow$ the spin current also manifests subgap structure, but only for odd values of $n$. The split steps corresponding to $n=1,2$ in subgap electric and spin currents are analytically calculated and the following steps are described qualitatively.

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