Toroidal order in a partially disordered state on a layered triangular lattice: implication to UNi4B
Abstract
A partial disorder on a layered triangular lattice is theoretically investigated from a viewpoint of toroidal ordering and magnetoelectric effects. We consider an extended periodic Anderson model including a site-dependent antisymmetric spin-orbit coupling between conduction and localized electrons. We show that, by the mean-field approximation, the model exhibits a coplanar vortex-lattice-type magnetic order as observed in a hexagonal uranium compound UNi4B, in the parameter region with intermediate hybridization and electron correlation. This peculiar state accommodates a toroidal order, which leads to the linear magnetoelectric effect. We discuss the implications of our results to UNi4B, focusing on the possible source of the site-dependent antisymmetric spin-orbit coupling.
Cite
@article{arxiv.1409.3657,
title = {Toroidal order in a partially disordered state on a layered triangular lattice: implication to UNi4B},
author = {Satoru Hayami and Hiroaki Kusunose and Yukitoshi Motome},
journal= {arXiv preprint arXiv:1409.3657},
year = {2015}
}
Comments
6 pages, 2 figures