We investigate elastic deformations of spin S=1/2 antiferromagnetic J1−J2 Heisenberg chains, at M=1/3 magnetization, coupled to phonons in the adiabatic approximation. Using a bosonization approach we predict the existence of non-homogeneous trimerized magnetoelastic phases. A rich ground state phase diagram is found, including classical and quantum plateau states for the magnetic sector as well as inequivalent lattice deformations within each magnetic phase. The analytical results are supported by exact diagonalization of small clusters.
@article{arxiv.0708.4162,
title = {Spin-Peierls-like phases in magnetoelastic $J_1-J_2$ antiferromagnetic chain at 1/3 magnetization},
author = {H. D. Rosales and G. L. Rossini},
journal= {arXiv preprint arXiv:0708.4162},
year = {2019}
}