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arXiv · cond-mat/9612025

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

Henrik Nordborg·Gianni Blatter
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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 dρ= 6.0*10^{-4} / λ(T)^2. The vortex liquid corresponds to a bosonic superfluid, with ρ_s = ρeven in the limit λ-> \infty.

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Henrik Nordborg, Gianni Blatter. 1997-04-22. Vortices and 2D bosons: A Path-Integral Monte Carlo Study. https://doi.org/10.1103/physrevlett.79.1925

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