Hiroshi Masuda, Tsuyoshi Okubo, Hikaru Kawamura
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. It is found that a first-order transition, which has no
counterpart in the corresponding undistorted model, takes place at a very low
temperature. Origin of the transition is discussed in terms of topological
excitations inherent to the model.
View original:
http://arxiv.org/abs/1201.5441
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