Observation of Macroscopic Quantum Effects in YBCO Thin Film Microbridge Rings

Abstract

ABSTRACTThin film rings with microbridge were constructed using high Tc Y-Ba-Cu-O super-conducting thin films which were made by laser ablation on the single crystal MgO(100) substrates. The thickness of the films is 5000 Å. The weak links were biased with an AC induced current. The resulting electron pair charges on the weak links were monitored by an output voltage. The charge stored on the link (as a function of the input bias voltage) is consistent with that of a “macroscopic quantum pendulum”