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

Diesch, S.; Machon, P.; Wolz, M.; Sürgers, C. 1; Beckmann, D. 2; Belzig, W.; Scheer, E.
1 Physikalisches Institut (PHI), Karlsruher Institut für Technologie (KIT)
2 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

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.

Verlagsausgabe §
DOI: 10.5445/IR/1000088340
Veröffentlicht am 08.12.2018
DOI: 10.1038/s41467-018-07597-w
Zitationen: 35
Web of Science
Zitationen: 34
Zitationen: 36
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2018
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000088340
HGF-Programm 43.21.02 (POF III, LK 01) Quantum Properties of Nanostructures
Erschienen in Nature Communications
Verlag Nature Research
Band 9
Heft 1
Seiten Article no 5248
Vorab online veröffentlicht am 07.12.2018
Nachgewiesen in Scopus
Web of Science
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