Evidence for triplet superconductivity in Josephson junctions with barriers of the ferromagnetic Heusler alloy Cu2MnAl

Sprungmann, D., Westerholt, K., Zabel, H., Weides, M. and Kohlstedt, H. (2010) Evidence for triplet superconductivity in Josephson junctions with barriers of the ferromagnetic Heusler alloy Cu2MnAl. Physical Review B, 82(6), 060505(R). (doi:10.1103/PhysRevB.82.060505)

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Abstract

We have studied Josephson junctions with barriers prepared from the Heusler compound Cu 2 MnAl . In the as-prepared state the Cu 2 MnAl 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   ° 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 Cu 2 MnAl layers.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Weides, Professor Martin
Authors: Sprungmann, D., Westerholt, K., Zabel, H., Weides, M., and Kohlstedt, H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:1098-0121
ISSN (Online):1550-235X
Published Online:09 August 2010

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