Abstract
The temporal structure of the instantaneous voltage generated by multiquantum flux tubes moving through a constricted type-I superconducting microbridge (in films of 2 μm thickness) is measured. By employing a high-resolution signal-averaging technique, we are able to record the total time development of the flux-flow voltage thereby yielding a voltage resolution of better than 10 nV at a recording bandwidth of 25 MHz (corresponding to a time resolution of 10 ns). All experimentally obtained voltage profiles agree well with the behavior expected from theoretical model calculations.
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