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Theory of Half Metal-Superconductor Heterostructures

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arxiv cond-mat/0206278 v2 pith:FL6F7662 submitted 2002-06-14 cond-mat.supr-con

M. Eschrig , J. Kopu , J. C. Cuevas , Gerd Schön This is my paper · ORCID
classification cond-mat.supr-con
keywords superconductorhalfcouplingmetalrotationspinsuperconductorstheory
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We investigate the coupling between two singlet superconductors separated by a half-metallic magnet. The mechanism behind the coupling is provided by the rotation of the quasiparticle spin in the superconductor during reflection events at the interface with the half metal. Spin rotation induces triplet correlations in the superconductor which, in the presence of surface spin-flip scattering, result in an indirect Josephson effect between the superconductors. We present a theory appropriate for studying this phenomenon and calculate physical properties for a superconductor/half metal/superconductor (S/HM/S) heterostructure.

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    In 1D SF1F2S Josephson junctions, a barrier at the F1/F2 interface creates critical-current resonance peaks at Q_i d_i = (n_i + 1/2)π, attributed to zero-spin-projection triplet pairs, with accumulated phase setting t...

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