Nano Lett. 2015 Mar 11;15(3):1803-8. doi: 10.1021/nl504544s. Epub 2015 Feb 16.

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

Nano letters

J Paajaste, M Amado, S Roddaro, F S Bergeret, D Ercolani, L Sorba, F Giazotto

PMID: 25671540 DOI: 10.1021/nl504544s

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 ∼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.

Keywords: InAs; Josephson effect; Nanowire; Pb; magnetic flux focusing

Publication Types

• Journal Article
• Research Support, Non-U.S. Gov't