Nematic order in square lattice frustrated ferromagnets
Abstract
We present a new scenario for the breakdown of ferromagnetic order in a two-dimensional quantum magnet with competing ferromagnetic and antiferromagnetic interactions. In this, dynamical effects lead to the formation of two-magnon bound states, which undergo Bose-Einstein condensation, giving rise to bond-centered nematic order. This scenario is explored in some detail for an extended Heisenberg model on a square lattice. In particular, we present numerical evidence confirming the existence of a state with d-wave nematic correlations but no long range magnetic order, lying between the saturated ferromagnetic and collinear antiferromagnetic phases of the ferromagnetic J1-J2 model. We argue by continuity of spectra that this phase is also present in a model with 4-spin cyclic exchange.
Cite
@article{arxiv.cond-mat/0512349,
title = {Nematic order in square lattice frustrated ferromagnets},
author = {Nic Shannon and Tsutomu Momoi and Philippe Sindzingre},
journal= {arXiv preprint arXiv:cond-mat/0512349},
year = {2009}
}
Comments
5 pages latex + 5 eps figures, accpeted for publication in Phys. Rev. Lett