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

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  • 2 December 1996
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 of dS approx 0.27 k_B per degree of freedom and a Lindemann number c_L approx 0.29. At low fields, lambda \approx a_0, the density is reduced by (delta rho)/rho approx 0.0003 upon melting. The vortex liquid corresponds to a bosonic superfluid, with rho_s = rho even in the limit lambda -> infinity.

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