The thermally induced distribution of transitions between fluxoid quantum states of a superconducting ring closed by a Josephson junction has been measured. The observed dependence of its width σ on temperature, ring inductance, and weak-link critical current, as well as its shape, confirms the recent theoretical results of Kurkij\"arvi, σ∝L(ic)1/3T2/3.
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Jackel et al. (1974) studied this question.
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