Subharmonic gap structure in superconductor/ferromagnet/superconductor junctions
I. V. Bobkova
DOI 10.1103/PhysRevB.73.012506 · Physical Review B
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Abstract
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↑) and spin-down (D↓) electrons. Due to the presence of Andreev bound states ±ε0 in the system the positions of subgap electric current steps eVn=(Δ±ε0)∕n are split at temperature T≠0 with respect to the nonmagnetic result eVn=2Δ∕n. It is found that under the condition D↑≠D↓ 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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