Chiral spin pairing in helical magnets
Strongly Correlated Electrons
2009-11-13 v2 Statistical Mechanics
Abstract
The Ginzburg-Landau Hamiltonian for incommensurate frustrated classical spin systems is analyzed. The coupling to phonons through the Dzyaloshinskii-Moriya interaction and/or the four-spin exchange interaction of the Coulomb origin under the egde-sharing network of magnetic and ligand ions drive chiral spin piarings, introducing two successive second-order phase transitions upon cooling. First, a vector spin-chiral order appears with an either parity, leaving an O(2) chiral spin liquid. Then, the O(2) symmetry is broken by the spin ordering into a helical magnetic state. Possible candidate materials are also discussed.
Cite
@article{arxiv.cond-mat/0703064,
title = {Chiral spin pairing in helical magnets},
author = {Shigeki Onoda and Naoto Nagaosa},
journal= {arXiv preprint arXiv:cond-mat/0703064},
year = {2009}
}
Comments
5 pages, inclluding one figure; some detailed derivations added; to appear in Phys. Rev. Lett