Volume 50, Number 6, June II 2000
|Page(s)||749 - 755|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Andreev scattering in nanoscopic junctions in a magnetic field
Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada
Instituto de Ciencia de Materiales Nicolás Cabrera,
Facultad de Ciencias, C-III Universidad Autónoma de
Madrid - E-28049 Madrid, Spain
2 Instituto de Ciencia de Materiales de Madrid Consejo Superior de Investigaciones Científicas Cantoblanco - E-28049 Madrid, Spain
3 Delft University of Technology, Laboratory of Applied Physics and DIMES 2628 CJ Delft, The Netherlands
Accepted: 10 April 2000
We report on the measurement of multiple Andreev resonances at atomic size point contacts between two superconducting nanostructures of Pb under magnetic fields higher than the bulk critical field, where superconductivity is restricted to a mesoscopic region near the contact. The small number of conduction channels in this type of contacts permits a quantitative comparison with theory through the whole field range. We discuss in detail the physical properties of our structure, in which the normal bulk electrodes induce a proximity effect into the mesoscopic superconducting part.
PACS: 61.16.Ch – Scanning probe microscopy: scanning tunneling, atomic force, scanning optical, magnetic force, etc / 73.23.-b – Mesoscopic systems / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects
© EDP Sciences, 2000
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