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Phase coherence in the hysteretic magnetic behavior of parallel Josephson-junction arrays

Physical Review B, ISSN: 0163-1829, Vol: 49, Issue: 21, Page: 15317-15321
1994
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We report on the hysteretic field-dependent critical currents of large inductance arrays with up to ten YBa2Cu3O7 grain-boundary junctions in parallel. A peak in the critical current, roughly equal to its initial zero-field value, is observed after each reversal of the field sweep. This behavior indicates that the junction phases become equal modulo 2π (self-organized phase coherence) as the system relaxes away from the critical state. The primary features can be modeled using a Frenkel-Kontorova model generalized to include global interactions due to mutual inductance. © 1994 The American Physical Society.

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