Vortices and 2D bosons: A Path-Integral Monte Carlo Study
Abstract
The vortex system in a high-T_c superconductor has been studied numerically using the mapping to 2D bosons and the path-integral Monte Carlo method. We find a single first-order transition from an Abrikosov lattice to an entangled vortex liquid. The transition is characterized by an entropy jump dS = 0.4 k_B per vortex and layer (parameters for YBCO) and a Lindemann number c_L = 0.25. The increase in density at melting is given by d\rho = 6.0*10^{-4} / \lambda(T)^2. The vortex liquid corresponds to a bosonic superfluid, with \rho_s = \rho even in the limit \lambda -> \infty.
Cite
@article{arxiv.cond-mat/9612025,
title = {Vortices and 2D bosons: A Path-Integral Monte Carlo Study},
author = {Henrik Nordborg and Gianni Blatter},
journal= {arXiv preprint arXiv:cond-mat/9612025},
year = {2009}
}
Comments
9 pages, RevTeX, 4 PostScript figures. The entropy jump at the transition has been recomputed and is now in agreement with experiments on YBCO. Some minor modifications were made in the text