Proceedings of the Second European Workshop on Low Temperature Electronics
J. Phys. IV France 06 (1996) C3-253-C3-257
Nonlocality and Magnetic Flux Sensitivity of Superconducting Mesoscopic Aluminium LoopsC. Strunk1, V. Bruyndoncx1, C. Van Haesendonck1, V.V. Moshchalkov1, Y. Bruynseraede1 and R. Jonckheere2
1 Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium
2 Interuniversity Microelectronics Center, Kapeldreef 75, 3001 Leuven, Belgium
We have measured the magnetoresistance and the magnetic phase boundaries Tc(B) of mesoscopic superconducting structures containing an Al loop. The structures were designed to study the nonlocal interaction between the loop and the electrical leads connected to it. Several voltage probes have been attached to the current leads to monitor the superconducting transitions of both the loop and the segments of the leads. Strong coupling effects have been found between the loop and the leads. At low magnetic fields, Tc(B) of the lead segments reveals a pronounced oscillatory component, while the oscillation amplitude of Tc(B) of the loop is significantly reduced when compared to the usual Little-Parks effect. The coupling strength seems to be controlled by the temperature dependent superconducting coherence length.
© EDP Sciences 1996