期刊
PHYSICAL REVIEW LETTERS
卷 84, 期 21, 页码 4966-4969出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4966
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We describe observations of spontaneous flux generation inside a YBn2Cu2O7-delta loop made of 214 Josephson junctions in series. The flux is generated spontaneously during cooldown into the superconducting state. The experiment is motivated by the Kibble-Zurck scenario of formation of topological defects in condensed matter systems. The transition from decoupled superconducting segments into a coherent loop is determined by the strength of thermal fluctuations in the junctions. Values of the flux measured at the end of each cooldown follow a normal distribution, and are consistent with the instantaneous phase differences across the junctions adding up as the loop becomes coherent.
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