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cond-mat.supr-con

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Observation of Josephson coupling through an interlayer of antiferromagnetically ordered chromium

Authors: M. Weides , M. Disch , H. Kohlstedt , Tommy Hilfiger Julea qqiwtQYkuJ

Abstract : The supercurrent transport in metallic Josephson tunnel junctions with an additional interlayer made up by chromium, being an itinerant antiferromagnet, was studied. Uniform Josephson coupling was observed as a function of the magnetic field. The supercurrent shows a weak dependence on the interlayer thickness for thin chromium layers and decays exponentially for thicker films. The diffusion con… ▽ More The supercurrent transport in metallic Josephson tunnel junctions with an additional interlayer made up by chromium, being an itinerant antiferromagnet, was studied. Uniform Josephson coupling was observed as a function of the magnetic field. The supercurrent shows a weak dependence on the interlayer thickness for thin chromium layers and decays exponentially for thicker films. The diffusion constant and the coherence length in the antiferromagnet were estimated. The antiferromagnetic state of the barrier was indirectly verified using reference samples. Our results are compared to macroscopic and microscopic models. △ Less

Submitted 12 August, 2009; v1 submitted 16 June, 2009; originally announced June 2009.

Comments: Phys. Rev. B (2009), in print

Journal ref: Phys. Rev. B 80, 064508 (2009)

arXiv:0905.0761 [, , SuperfeetPremium Black DnNbXRM9Q
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cond-mat.supr-con

doi 10.1088/0022-3727/42/7/075005

Josephson tunnel junctions with ferromagnetic \Fe_{0.75}\Co_{0.25} barriers

Abstract : Josephson tunnel junctions with the strong ferromagnetic alloy \Fe_{0.75}\Co_{0.25} as the barrier material were studied. The junctions were prepared with high quality down to a thickness range of a few monolayers of Fe-Co. An oscillation length of ξ_{F2}\approx 0.79\:{\rm {nm}} between 0 and π -Josephson phase coupling and a very short decay length ξ_{F1}\approx 0.22\:{\rm {nm}} for the… ▽ More Josephson tunnel junctions with the strong ferromagnetic alloy \Fe_{0.75}\Co_{0.25} as the barrier material were studied. The junctions were prepared with high quality down to a thickness range of a few monolayers of Fe-Co. An oscillation length of ξ_{F2}\approx 0.79\:{\rm {nm}} between 0 and π -Josephson phase coupling and a very short decay length ξ_{F1}\approx 0.22\:{\rm {nm}} for the amplitude of the superconducting pair wave function in the Fe-Co layer were determined. The rapid damping of the pair wave function inside the Fe-Co layer is caused by the strong ferromagnetic exchange field and additional magnetic pair breaking scattering. Josephson junctions with Fe-Co barriers show a significantly increased tendency towards magnetic remanence and flux trapping for larger thicknesses d_{F} . △ Less

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