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Creation of equal-spin triplet superconductivity at the Al/EuS interface

Author

Listed:
  • S. Diesch

    (University of Konstanz)

  • P. Machon

    (University of Konstanz)

  • M. Wolz

    (University of Konstanz)

  • C. Sürgers

    (Karlsruhe Institute of Technology (KIT))

  • D. Beckmann

    (Karlsruhe Institute of Technology (KIT))

  • W. Belzig

    (University of Konstanz)

  • E. Scheer

    (University of Konstanz)

Abstract

In conventional superconductors, electrons of opposite spins are bound into Cooper pairs. However, when the superconductor is in contact with a non-uniformly ordered ferromagnet, an exotic type of superconductivity can appear at the interface, with electrons bound into three possible spin-triplet states. Triplet pairs with equal spin play a vital role in low-dissipation spintronics. Despite the observation of supercurrents through ferromagnets, spectroscopic evidence for the existence of equal-spin triplet pairs is still missing. Here we show a theoretical model that reveals a characteristic gap structure in the quasiparticle density of states which provides a unique signature for the presence of equal-spin triplet pairs. By scanning tunnelling spectroscopy we measure the local density of states to reveal the spin configuration of triplet pairs. We demonstrate that the Al/EuS interface causes strong and tunable spin-mixing by virtue of its spin-dependent transmission.

Suggested Citation

  • S. Diesch & P. Machon & M. Wolz & C. Sürgers & D. Beckmann & W. Belzig & E. Scheer, 2018. "Creation of equal-spin triplet superconductivity at the Al/EuS interface," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-07597-w
    DOI: 10.1038/s41467-018-07597-w
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