title: Chiral Kosterlitz-Thouless transition in the frustrated Heisenberg antiferromagnet on a pyrochlore slab.
abstract: Ordering of the geometrically frustrated two-dimensional Heisenberg antiferromagnet on a pyrochlore slab is studied by Monte Carlo simulations. In contrast to the kagomé Heisenberg antiferromagnet, the model exhibits locally noncoplanar spin structures at low temperatures, bearing nontrivial chiral degrees of freedom. Under certain conditions, the model exhibits a novel Kosterlitz-Thouless-type transition at a finite temperature associated with these chiral degrees of freedom.
authors.affiliation: Department of Earth and Space Science, Faculty of Science, Osaka University, Toyonaka 560-0043, Japan.
authors.forename: Hikaru
authors.initials: H
authors.lastname: Kawamura
authors.forename: Takuya
authors.initials: T
authors.lastname: Arimori