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arXiv · 1411.0990

Pb/InAs nanowire Josephson junction with high critical current and magnetic flux focusing

J. Paajaste·M. Amado·S. Roddaro·F. S. Bergeret·D. Ercolani·L. Sorba·F. Giazotto
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Abstract

We have studied mesoscopic Josephson junctions formed by highly $n$-doped InAs nanowires and superconducting Ti/Pb source and drain leads. The current-voltage properties of the system are investigated by varying temperature and external out-of-plane magnetic field. Superconductivity in the Pb electrodes persists up to $ \sim 7$ K and with magnetic field values up to 0.4 T. Josephson coupling at zero backgate voltage is observed up to 4.5 K and the critical current is measured to be as high as 615 nA. The supercurrent suppression as a function of the magnetic field reveals a diffraction pattern that is explained by a strong magnetic flux focusing provided by the superconducting electrodes forming the junction.

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J. Paajaste, M. Amado, S. Roddaro, F. S. Bergeret, D. Ercolani, L. Sorba, F. Giazotto. 2015-03-25. Pb/InAs nanowire Josephson junction with high critical current and magnetic flux focusing. https://doi.org/10.1021/nl504544s

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