Document Europhys. Lett, 36 (6), pp. 449-454 (1996)
Fluxoid quantization effects in superconducting mesoscopic Al multiloop structures
V. Bruyndoncx, C. Strunk, V. V. Moshchalkov, C. Van Haesendonck and Y. Bruynseraede
Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
(received 5 August 1996; accepted 10 October 1996)
PACS. 73.23
- Mesoscopic systems.
PACS. 74.25Dw - Phase diagrams.
PACS. 74.62
- Transition temperature variations.
Abstract:
We have studied fluxoid quantization effects in mesoscopic Al samples consisting of a small number of square loops. In short microladders a pronounced substructure of the Little-Parks oscillations (i.e. the oscillations of the critical temperature
as
a function of the applied magnetic flux 
) has been found.
These new features in 
originate from
transitions between different quantum states, each having a specific
order parameter profile and flow pattern of the supercurrents. The
experimental data are in excellent agreement with the 
calculated within the de Gennes-Alexander model for
superconducting micronetworks.
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