Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 54: Superconductivity: Heterostructures

TT 54.4: Vortrag

Mittwoch, 18. März 2015, 10:30–10:45, H 3005

Triplet correlations at ferromagnet/superconductor interfaces: Mechanism and implications — •Daniel Fritsch and James F. Annett — H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom

The interface between a ferromagnet and an s-wave superconductor offers a rich variety of physical phenomenons due to different intrinsic correlation effects. Even more interesting phenomenons are to be expected if the interface region allows for some kind of spin-flip mechanism, thus generating equal-spin spin-triplet correlations which are compatible with the ferromagnetic exchange field and leading to the observable long-range proximity effect.

Here, we present results based on numerical solutions of the spin-generalised microscopic Bogoliubov−de Gennes equations incorporating a tight-binding model in the clean limit [1-3]. We compare different types of interfaces that have been suggested to generate spin-triplet pairing correlations and discuss implications on the effectiveness.

[1] D. Fritsch and J. F. Annett, New J. Phys. 16, 055005 (2014).

[2] D. Fritsch and J. F. Annett,

J. Phys.: Condens. Matter 26, 274212 (2014).

[3] D. Fritsch and J. F. Annett,

Phil. Mag., accepted and published online (2014).