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We report a new type of oscillation arising from the coherent motion of large numbers of flux quanta across small-area superconducting contacts. It produces a unique spectrum at the frequency ωD when 2πnV₀=NΦ₀ωD, where V₀ is the dc voltage across the contact, n is an integer, Φ₀=h/2e, and N is the number of flux quanta crossing per cycle. The power dependence varies as N² with values of N from 1 to 200 observed.
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Zimmerman et al. (1967) studied this question.
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