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

J. H. Miller, Jr.; G. H. Gunaratne; Z. Zou; M. F. Davis; H. R. Rampersad; J. C. Wolfe

doi:10.1103/PhysRevB.49.15317

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

J. H. Miller, Jr., G. H. Gunaratne, Z. Zou, M. F. Davis, H. R. Rampersad, J. C. Wolfe

DOI 10.1103/PhysRevB.49.15317 · Physical Review B

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown