Andreev Reflection and Spin Injection into $s-$ and $d-$wave Superconductors

Details Andreev Reflection and Spin Injection into $s-$ and $d-$wave Superconductors Andreev Reflection and Spin Injection into $s-$ and $d-$wave Superconductors

1999-01-02

arxiv.org/abs/cond-mat/9901004v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, REVTEX, 1 figure included; typos corrected

Scientific paper

10.1103/PhysRevLett.83.5326

We study the effect of spin injection into $s-$ and $d-$wave superconductors, with an emphasis on the interplay between boundary and bulk spin transport properties. The quantities of interest include the amount of non-equilibrium magnetization ($m$), as well as the induced spin-dependent current ($I_s$) and boundary voltage ($V_s$). In general, the Andreev reflection makes each of the three quantities depend on a different combination of the boundary and bulk contributions. The situation simplifies either for half-metallic ferromagnets or in the strong barrier limit, where both $V_s$ and $m$ depend solely on the bulk spin transport/relaxation properties. The implications of our results for the on-going spin injection experiments in high $T_c$ cuprates are discussed.

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