Anisotropy in the helicity modulus of a 3D XY-model: application to YBCO

Details Anisotropy in the helicity modulus of a 3D XY-model: application to YBCO Anisotropy in the helicity modulus of a 3D XY-model: application to YBCO

2003-01-27

arxiv.org/abs/cond-mat/0301530v1

J. Phys.: Condens. Matter 15, 2207 (2003).

Physics

Condensed Matter

Superconductivity

7 pages, 1 figure

Scientific paper

10.1088/0953-8984/15/13/306

We present a Monte Carlo study of the helicity moduli of an anisotropic classical three-dimensional (3D) XY-model of YBCO in superconducting state. It is found that both the ab-plane and the c-axis helicity moduli, which are proportional to the inverse square of the corresponding magnetic field penetration depth, vary linearly with temperature at low temperatures. The result for the c-axis helicity modulus is in disagreement with the experiments on high quality samples of YBCO. Thus we conclude that purely classical phase fluctuations of the superconducting order parameter cannot account for the observed c-axis electrodynamics of YBCO.

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