Fluxoid quantization effects in superconducting mesoscopic Al multiloop structures
Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven,
Celestijnenlaan 200D, B-3001 Leuven, Belgium
Accepted: 10 October 1996
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 Tc 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.
PACS: 73.23.-b – Mesoscopic systems / 74.25.Dw – Phase diagrams / 74.62.-c – Transition temperature variations
© EDP Sciences, 1996