Creation of equal-spin triplet superconductivity at the Al/EuS interface
| Autor: | Diesch, Simon, Machon, Peter, Wolz, Michael, Sürgers, Christoph, Beckmann, Detlef, Belzig, Wolfgang, Scheer, Elke |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Nat. Comm. 9, 5248 (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41467-018-07597-w |
| Popis: | 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. Comment: 10 pages, 4 figures, 17 pages supplementary information, 14 supplementary figures |
| Databáze: | arXiv |
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