Finite-temperature properties of frustrated classical spins coupled to the lattice

Details Finite-temperature properties of frustrated classical spins coupled to the lattice Finite-temperature properties of frustrated classical spins coupled to the lattice

2005-03-03

arxiv.org/abs/cond-mat/0503080v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages and 8 figures

Scientific paper

10.1103/PhysRevB.72.024449

We present extensive Monte Carlo simulations for a classical antiferromagnetic Heisenberg model with both nearest ($J_1$) and next-nearest ($J_2$) exchange couplings on the square lattice coupled to the lattice degrees of freedom. The Ising-like phase transition, that appears for $J_2/J_1>1/2$ in the pure spin model, is strengthened by the spin-lattice coupling, and is accompanied by a lattice deformation from a tetragonal symmetry to an orthorhombic one. Evidences that the universality class of the transition does not change with the inclusion of the spin-lattice coupling are reported. Implications for ${\rm Li_2VOSiO_4}$, the prototype for a layered $J_1{-}J_2$ model in the collinear regime, are also discussed.

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