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

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2018

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Sürgers, Christoph
Beckmann, Detlef

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http://nbn-resolving.de/urn:nbn:de:bsz:352-2-1riceou923zpx1
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https://doi.org/10.1038/s41467-018-07597-w
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CC BY 4.0

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Physik: Publikationen
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Published

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Nature Communications. 2018, 9(1), 5248. eISSN 2041-1723. Available under: doi: 10.1038/s41467-018-07597-w

Zusammenfassung

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.

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530 Physik

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ISO 690DIESCH, Simon, Peter MACHON, Michael WOLZ, Christoph SÜRGERS, Detlef BECKMANN, Wolfgang BELZIG, Elke SCHEER, 2018. Creation of equal-spin triplet superconductivity at the Al/EuS interface. In: Nature Communications. 2018, 9(1), 5248. eISSN 2041-1723. Available under: doi: 10.1038/s41467-018-07597-w
BibTex
@article{Diesch2018-12-07Creat-44262,
  year={2018},
  doi={10.1038/s41467-018-07597-w},
  title={Creation of equal-spin triplet superconductivity at the Al/EuS interface},
  number={1},
  volume={9},
  journal={Nature Communications},
  author={Diesch, Simon and Machon, Peter and Wolz, Michael and Sürgers, Christoph and Beckmann, Detlef and Belzig, Wolfgang and Scheer, Elke},
  note={Article Number: 5248}
}
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