title: Pb/InAs nanowire josephson junction with high critical current and magnetic flux focusing.
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.
authors: NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore , I-56127 Pisa, Italy.
authors: J
authors: J
authors: Paajaste
authors: M
authors: M
authors: Amado
authors: S
authors: S
authors: Roddaro
authors: F S
authors: FS
authors: Bergeret
authors: D
authors: D
authors: Ercolani
authors: L
authors: L
authors: Sorba
authors: F
authors: F
authors: Giazotto
keywords: InAs; Josephson effect; Nanowire; Pb; magnetic flux focusing