Volume 50, Number 2, April II 2000
|Page(s)||250 - 256|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
π-shifted magnetoconductance oscillations in mesoscopic superconducting-normal heterostructures
NTT Basic Research
Laboratories - 3-1 Morinosato-Wakamiya Atsugi-Shi, Kanagawa 243-01,
2 Institut für Theoretische Festkörperphysik, Universität Karlsruhe D-76128 Karlsruhe, Germany
3 Forschungszentrum Karlsruhe GmbH, Institut für Nanotechnologie D-76021 Karlsruhe, Germany
4 P. N. Lebedev Physics Institute Leninskii prospect 53, 117924 Moscow, Russia
Accepted: 31 January 2000
Interference of proximity-induced superconducting correlations in mesoscopic metallic rings is sensitive to the magnetic flux Φ inside these rings. This is the reason for magnetoconductance oscillations in such systems. We detected experimentally and explained theoretically a novel effect: the phase of these oscillations can switch between 0 and π depending on the resistance of intermetallic interfaces and temperature. The effect is due to a nontrivial interplay between the proximity-induced enhancement of the local conductivity and the proximity-induced suppression of the density of states at low energies.
PACS: 73.23-b – Mesoscopic systems / 74.50+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.40+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization etc.)
© EDP Sciences, 2000
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