The triangual antiferromagnet with infinite nearest-neighbour coupling
G.T. Einevoll; P.C. Hemmer,
Institutt for Fysikk, NTH,
Universitetet i Trondheim, 7034 Trondheim, Norway
Journal of Physics C: Solid State Physics 21, L615-L621 (1988)
Abstract
The authors show how the exact interface free energy F for the Ising
antiferromagnet on the triangular lattice with infinite first-neighbour
and finite second-neighbour interactions can be determined analytically.
From considerations of the angular dependence of the interface free energy
they conclude that the transition is not second order. An upper bound for
the transition temperature is given.