Peierls-like transition induced by frustration in a two-dimensional antiferromagnet

Abstract

We show that the introduction of frustration into the spin-1/2 two-dimensional (2D) antiferromagnetic Heisenberg model on a square lattice via a next-nearest neighbor exchange interaction can lead to a Peierls-like transition, from a tetragonal to an orthorhombic phase, when the spins are coupled to adiabatic phonons. The two different orthorhombic ground states define an Ising order parameter, which is expected to lead to a finite temperature transition. Implications for $\mathrm{L}{\mathrm{i}}_2\mathrm{VOSi}{\mathrm{O}}_4$, the first realization of that model, will be discussed.

4 pages, to be published on Physical Review Letters

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