Journal Article

PreJuSER-10833

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Evidence for triplet superconductivity in Josephson junctions with ferromagnetic Cu2MnAl-Heusler barriers

Sprungmann, D. ; Westerholdt, K. ; Zabel, H. ; Weides, M.FZJ* ; Kohlstedt, H.

2010
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10979  doi:10.1103/PhysRevB.82.060505

Abstract: We have studied Josephson junctions with barriers prepared from the Heusler compound Cu2MnAl. In the as-prepared state the Cu2MnAl layers are nonferromagnetic and the critical Josephson current density j(c) decreases exponentially with the thickness of the Heusler layers d(F). On annealing the junctions at 240 degrees C the Heusler layers develop ferromagnetic order and we observe a dependence j(c)(d(F)) with j(c) strongly enhanced and weakly thickness dependent in the thickness range 7.0 < d(F) < 10.6 nm. We interpret this feature as an indication of a triplet component in the superconducting pairing function generated by the specific magnetization profile inside thin Cu2MnAl layers.

Keyword(s): J

Note: The authors thank the DFG for funding this work within the DFG under Project No. WE 4359/1-1 and within the SFB 491. Additionally we thank A. F. Volkov, M. Fistoul, and K. B. Efetov for valuable discussions.

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Contributing Institute(s):

1. Elektronische Materialien (IFF-6)
2. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2010

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