Physics – Condensed Matter – Superconductivity
Scientific paper
2004-03-23
Phys. Rev. B 69, 172501 (2004)
Physics
Condensed Matter
Superconductivity
RevTex4, 4 pages, 4 eps figures, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.69.172501
To study the properties of frustrated two-dimensional Josephson junction arrays near incommensurability, we examine the current-voltage characteristics of a square proximity-coupled Josephson junction array at a sequence of frustrations f=3/8, 8/21, 0.382 $(\approx (3-\sqrt{5})/2)$, 2/5, and 5/12. Detailed scaling analyses of the current-voltage characteristics reveal approximately universal scaling behaviors for f=3/8, 8/21, 0.382, and 2/5. The approximately universal scaling behaviors and high superconducting transition temperatures indicate that both the nature of the superconducting transition and the vortex configuration near the transition at the high-order rational frustrations f=3/8, 8/21, and 0.382 are similar to those at the nearby simple frustration f=2/5. This finding suggests that the behaviors of Josephson junction arrays in the wide range of frustrations might be understood from those of a few simple rational frustrations.
Baek In-Cheol
Choi Mu-Yong
Yun Young-Je
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