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arXiv · 1811.08825

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

Simon Diesch·Peter Machon·Michael Wolz·Christoph Sürgers·Detlef Beckmann·Wolfgang Belzig·Elke Scheer
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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.

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Simon Diesch, Peter Machon, Michael Wolz, Christoph Sürgers, Detlef Beckmann, Wolfgang Belzig, Elke Scheer. 2018-11-21. Creation of equal-spin triplet superconductivity at the Al/EuS interface. https://doi.org/10.1038/s41467-018-07597-w

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