Superconducting phase transitions in frustrated Josephson-junction arrays on a dice lattice

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dc.creatorBaek, In-Cheol
dc.creatorYun, Young-Je
dc.creatorChoi, Mu-Yong
dc.date2008-11-28
dc.date.accessioned2026-07-07T12:06:20Z
dc.date.available2026-07-07T12:06:20Z
dc.descriptionTransport measurements are carried out on dice Josephson-junction arrays with the frustration index $f=1/3$ and 1/2 which possess, within the limit of the $XY$ model, an accidental degeneracy of the ground states as a consequence of the formation of zero-energy domain walls. The measurements demonstrate that both the systems undergo a phase transition to a superconducting vortex-ordered state at considerably high temperatures. The experimental findings are in apparent contradiction with the theoretical expectation that frustration effects in the $f=1/3$ system are particularly strong enough to suppress a vortex-ordering transition down to near zero temperature. The data for $f=1/2$ are more consistent with theoretical evaluations. The agreement between the experiments and the Monte Carlo simulations of a $XY$ model for $f=1/3$ suggests that the order-from-disorder mechanism for the removal of an accidental degeneracy may still be effective in the $f=1/3$ system. The transport data also reveal that the dice arrays with zero-energy domain walls experience a much slower critical relaxation than other frustrated arrays only with finite-energy walls.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0811.4675
dc.identifierhttp://arxiv.org/abs/0811.4675
dc.identifierPhysica C 468, 2267 (2008)
dc.identifierdoi:10.1016/j.physc.2008.07.004
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/208625
dc.subjectSuperconductivity
dc.subjectStatistical Mechanics
dc.titleSuperconducting phase transitions in frustrated Josephson-junction arrays on a dice lattice
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