Topological phase transitions in frustrated magnets
The role of topological excitations in frustrated Heisenberg antiferromagnets between two and three spatial dimensions is considered. In particular, the antiferromagnetic Heisenberg model on a stacked triangular geometry with a finite number of layers is studied using Monte Carlo methods. A phase transition that is purely topological in nature occurs at a finite temperature for all film thicknesses. The results indicate that topological excitations are important for a complete understanding of the critical properties of the model between two and three dimensions.
TRIANGULAR LATTICE, MONTE-CARLO, HEISENBERG-ANTIFERROMAGNET, XY, SYSTEMS, ORDER, MODEL
Canadian Journal of Physics, JAN 2006; 84(6-7):517-522.