International Conference on Strongly Correlated Electron Systems 2014 | |
Toroidal order in a partially disordered state on a layered triangular lattice: implication to UNi4B | |
Hayami, Satoru^1 ; Kusunose, Hiroaki^2 ; Motome, Yukitoshi^1 | |
Department of Applied Physics, University of Tokyo, Tokyo | |
113-8656, Japan^1 | |
Department of Physics, Ehime University, Matsuyama | |
790-8577, Japan^2 | |
关键词: Layered triangular lattice; Linear magnetoelectric effects; Localized electrons; Mean field approximation; Parameter regions; Partially disordered state; Periodic Anderson model; Spin-orbit couplings; | |
Others : https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012101/pdf DOI : 10.1088/1742-6596/592/1/012101 |
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来源: IOP | |
【 摘 要 】
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.
【 预 览 】
Files | Size | Format | View |
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Toroidal order in a partially disordered state on a layered triangular lattice: implication to UNi4B | 607KB | download |