Vortices and 2D bosons: A Path-Integral Monte Carlo Study

Details Vortices and 2D bosons: A Path-Integral Monte Carlo Study Vortices and 2D bosons: A Path-Integral Monte Carlo Study

1996-12-02

arxiv.org/abs/cond-mat/9612025v3

Phys. Rev. Lett. 79 1925 (1997)

Physics

Condensed Matter

Superconductivity

9 pages, RevTeX, 4 PostScript figures. The entropy jump at the transition has been recomputed and is now in agreement with exp

Scientific paper

10.1103/PhysRevLett.79.1925

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.

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