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Negative four-terminal resistance as a probe of crossed Andreev reflection

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Abstract

We report on the experimental investigation of electronic transport in superconductor-ferromagnet spin-valve structures. Our samples consist of two ferromagnetic iron leads forming planar tunnel contacts to a superconducting aluminum wire. Current is injected into one of the contacts while the voltage is monitored at the other, thus defining a four-probe resistance. At energies below the superconducting gap, we observe a negative four-probe resistance that can be explained by crossed Andreev reflection.

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Author information

Authors and Affiliations

  1. Institut für Nanotechnologie, Forschungszentrum Karlsruhe, P.O. Box 3640, 76021, Karlsruhe, Germany

    D. Beckmann

  2. Institut für Festkörperphysik, Forschungszentrum Karlsruhe, P.O. Box 3640, 76021, Karlsruhe, Germany

    H. v. Löhneysen

  3. Physikalisches Institut, Universität Karlsruhe, 76128, Karlsruhe, Germany

    H. v. Löhneysen

Authors
  1. D. Beckmann
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  2. H. v. Löhneysen
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Correspondence to D. Beckmann.

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PACS

74.45.+c; 85.75.-d; 03.67.Mn

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Beckmann, D., v. Löhneysen, H. Negative four-terminal resistance as a probe of crossed Andreev reflection. Appl. Phys. A 89, 603–607 (2007). https://doi.org/10.1007/s00339-007-4193-4

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  • DOI: https://doi.org/10.1007/s00339-007-4193-4

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