Phase and vortex correlations in Josephson-junction arrays at irrational frustration

Details Phase and vortex correlations in Josephson-junction arrays at irrational frustration Phase and vortex correlations in Josephson-junction arrays at irrational frustration

2008-06-16

arxiv.org/abs/0806.2654v1

Phys. Rev. Lett. 101, 027004 (2008)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.027004

Phase coherence and vortex order in a Josephson-junction array at irrational frustration are studied by extensive Monte Carlo simulations using the parallel tempering method. A scaling analysis of the correlation length of phase variables in the full equilibrated system shows that the critical temperature vanishes with a power-law divergent correlation length and critical exponent $\nu_{ph}$, in agreement with recent results from resistivity scaling analysis. A similar scaling analysis for vortex variables reveals a different critical exponent $\nu_{v}$, suggesting that there are two distinct correlation lengths associated with a decoupled zero-temperature phase transition.

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