Reentrant behavior of the phase stiffness in Josephson junction arrays

Details Reentrant behavior of the phase stiffness in Josephson junction arrays Reentrant behavior of the phase stiffness in Josephson junction arrays

2003-06-11

arxiv.org/abs/cond-mat/0306291v2

Phys. Rev. Lett. 91, 247004 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 7 figures, to appear in Phys.Rev.Lett

Scientific paper

10.1103/PhysRevLett.91.247004

The phase diagram of a 2D Josephson junction array with large substrate resistance, described by a quantum XY model, is studied by means of Fourier path-integral Monte Carlo. A genuine Berezinskii-Kosterlitz-Thouless transition is found up to a threshold value g* of the quantum coupling, beyond which no phase coherence is established. Slightly below g* the phase stiffness shows a reentrant behavior with temperature, in connection with a low-temperature disappearance of the superconducting phase, driven by strong nonlinear quantum fluctuations.

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