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

TY - JOUR

T1 - Finite-temperature properties of frustrated classical spins coupled to the lattice

AU - Weber, C.

AU - Becca, F.

AU - Mila, F.

PY - 2005/7/22

Y1 - 2005/7/22

N2 - We present extensive Monte Carlo simulations for a classical antiferromagnetic Heisenberg model with both nearest (J1) and next-nearest (J2) exchange couplings on the square lattice coupled to the lattice degrees of freedom. The Ising-like phase transition, which appears for J2/J1>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. Evidence that the universality class of the transition does not change with the inclusion of the spin-lattice coupling is reported. Implications for Li2VOSiO4, the prototype for a layered J1−J2 model in the collinear regime, are also discussed.

AB - We present extensive Monte Carlo simulations for a classical antiferromagnetic Heisenberg model with both nearest (J1) and next-nearest (J2) exchange couplings on the square lattice coupled to the lattice degrees of freedom. The Ising-like phase transition, which appears for J2/J1>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. Evidence that the universality class of the transition does not change with the inclusion of the spin-lattice coupling is reported. Implications for Li2VOSiO4, the prototype for a layered J1−J2 model in the collinear regime, are also discussed.

U2 - 10.1103/PhysRevB.72.024449

DO - 10.1103/PhysRevB.72.024449

M3 - Article

SN - 1550-235X

SN - 2469-9969

VL - 72

SP - N/A

JO - Physical Review B

JF - Physical Review B

IS - 2

M1 - 024449

ER -