Andreev Reflection and Spin Injection into s- and d-Wave Superconductors

Robert L. Merrill; Qimiao Si

doi:10.1103/PhysRevLett.83.5326

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Andreev Reflection and Spin Injection into s- and d-Wave Superconductors

Robert L. Merrill, Qimiao Si

DOI 10.1103/PhysRevLett.83.5326 · Physical Review Letters

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Abstract

We study the effect of spin injection into s- and d-wave superconductors. The quantities of interest include the amount of injected magnetization ( m), the induced spin-dependent current ( Is), and boundary voltage ( Vs). In general, Andreev reflection makes each of the three quantities depend on a different combination of the boundary and bulk contributions. We identify the conditions under which some of these quantities depend solely on the bulk properties. We also establish a correlation between the Andreev bound states and the spin-injection characteristics, which implies a strong directional dependence of spin injection into high temperature superconductors.