Anisotropy in the helicity modulus of a quantum 3D XY-model: application to YBCO
Superconductivity
2009-11-10 v1 Statistical Mechanics
Abstract
We present a variational study of the helicity moduli of an anisotropic quantum 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 with temperature T as T to the fourth power in the zero temperature limit. Moreover, the c-axis helicity modulus drops with temperature much faster than the ab-plane helicity modulus because of the weaker Josephson couplings along the c-axis compared to those along the ab-plane. These findings are in disagreement with the experiments on high quality samples of YBCO.
Cite
@article{arxiv.cond-mat/0310310,
title = {Anisotropy in the helicity modulus of a quantum 3D XY-model: application to YBCO},
author = {B. Mitrovic and K. Samokhin and S. K. Bose},
journal= {arXiv preprint arXiv:cond-mat/0310310},
year = {2009}
}
Comments
9 pages, 1 figure