Abstract
The electron transport of non-equilibrium quasiparticles injected into superconducting aluminum from a normal metal has been experimentally studied at ultralow temperatures. We studied hybrid nanostructures in the form of a T-shaped normal metal electrode (copper)—a dielectric tunnel layer (aluminum oxide)—a superconducting fork (aluminum), which can be considered as a solid-state analogue of a double-slit optical interferometer. At fixed bias voltages larger than the superconducting gap, a non-monotonic dependence of the tunnel current on perpendicular magnetic field has been observed. The effect is interpreted as the presence of a coherent component of the quasiparticle current.
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ACKNOWLEDGMENTS
The authors are grateful to Terhi Hongisto for her assistance in preparing the samples.
Funding
The work was supported by the Russian Science Foundation, project no. 23-72-00018 “Study of nonequilibrium and boundary phenomena in superconducting hybrid nanostructures”.
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Gurskiy, A.S., Shapovalov, D.L. & Arutyunov, K.Y. Transport of Non-Equilibrium Quasiparticle Excitations in Superconducting Aluminum. Bull. Russ. Acad. Sci. Phys. (2024). https://doi.org/10.1134/S1062873824706640
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DOI: https://doi.org/10.1134/S1062873824706640