title: Finite-temperature transition of the antiferromagnetic Heisenberg model on a distorted kagome lattice.
abstract: Motivated by the recent experiment on kagome-lattice antiferromagnets, we study the zero-field ordering behavior of the antiferromagnetic classical Heisenberg model on a uniaxially distorted kagome lattice by Monte Carlo simulations. A first-order transition, which has no counterpart in the corresponding undistorted model, takes place at a very low temperature. The origin of the transition is ascribed to a cooperative proliferation of topological excitations inherent to the model.
authors.affiliation: Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Masuda
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Okubo
authors.forename: Hikaru
authors.initials: H
authors.lastname: Kawamura