Superconducting triplet pairing in Al/Al₂O₃/Ni/Ga junctions

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Item type:	Article
Journal or Publication Title:	arXiv preprint
Date:	8 February 2021
Institutions:	Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian
Projects:	NSF Grant DMR 1700137, ONR Grant N00014-16-1-2657, ONR Grant N00014-20-1-2306, John Templeton Foundation Grant 39944, John Templeton Foundation Grant 60148, Elite Network of Bavaria, SFB 1277: Emergente relativistische Effekte in der Kondensierten Materie: Von grundlegenden Aspekten zu elektronischer Funktionalität
Dewey Decimal Classification:	500 Science > 530 Physics
Status:	Published
Refereed:	No, this version has not been refereed yet (as with preprints)
Created at the University of Regensburg:	Yes
Item ID:	44797

Abstract

Ni/Ga bilayers are a versatile playground for exploring the competition of the strongly antagonistic ferromagnetic and superconducting phases. Systematically characterizing this competition’s impact on highly ballistic Al/Al₂O₃/Ni/Ga junctions’ transport properties from both the experimental and theoretical viewpoints, we identify novel conductance peak structures, which are caused by ...

Abstract

Ni/Ga bilayers are a versatile playground for exploring the competition of the strongly antagonistic ferromagnetic and superconducting phases. Systematically characterizing this competition’s impact on highly ballistic Al/Al₂O₃/Ni/Ga junctions’ transport properties from both the experimental and theoretical viewpoints, we identify novel conductance peak structures, which are caused by superconducting triplet pairings at the Ni/Ga interface, and which are widely adjustable through the Ni–Ga thickness ratio. We demonstrate that these conductance anomalies persist even in the presence of an in-plane magnetic field, which provides—together with the detection of the paramagnetic Meissner effect in Ga—the clear experimental evidence that the observed conductance features serve indeed as the triplet pairings’ unique transport fingerprints. Our work demonstrates that Ni/Ga bilayers have a strong potential for superconducting spintronics applications, in particular for triplet-pairing engineering.

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