Bw. Southern et Hj. Xu, MONTE-CARLO STUDY OF THE HEISENBERG-ANTIFERROMAGNET ON THE TRIANGULARLATTICE, Physical review. B, Condensed matter, 52(6), 1995, pp. 3836-3839
We report a Monte Carlo study of the classical antiferromagnetic Heise
nberg model on the triangular lattice. The free-energy cost for the fo
rmation of free vortices is obtained from a vorticity modulus. Evidenc
e of a Kosterlitz-Thouless type of defect-mediated phase transition at
a finite temperature is found.