Spin-Wave Theory of the Multiple-Spin Exchange Model on a Triangular Lattice in a Magnetic Field : 3-Sublattice Structures
Strongly Correlated Electrons
2009-11-11 v1
Abstract
We study the spin wave in the S=1/2 multiple-spin exchange model on a triangular lattice in a magnetic field within the linear spin-wave theory. We take only two-, three- and four-spin exchange interactions into account and restrict ourselves to the region where a coplanar three-sublattice state is the mean-field ground state. We found that the Y-shape ground state survives quantum fluctuations and the phase transition to a phase with a 6-sublattice structure occurs with softening of the spin wave. We estimated the quantum corrections to the ground state sublattice magnetizations due to zero-point spin-wave fluctuations.
Keywords
Cite
@article{arxiv.cond-mat/0605318,
title = {Spin-Wave Theory of the Multiple-Spin Exchange Model on a Triangular Lattice in a Magnetic Field : 3-Sublattice Structures},
author = {Chitoshi Yasuda and Daisuke Kinouchi and Kenn Kubo},
journal= {arXiv preprint arXiv:cond-mat/0605318},
year = {2009}
}
Comments
8 pages, 20 figures