Toroidal order in a partially disordered state on a layered triangular lattice: implication to UNi4B
Toroidal order in a partially disordered state on a layered triangular lattice: implication to UNi4B
复制标题
DOI：
10.1088/1742-6596/592/1/012101
复制
发表时间：
2014-09
期刊：
影响因子：
--
通讯作者：
S. Hayami;H. Kusunose;Y. Motome
中科院分区：
文献类型：
--
作者：
S. Hayami;H. Kusunose;Y. Motome
从环向有序化和磁电效应的角度，从理论上研究了层状三角形晶格上的偏序现象。我们考虑了一个扩展的周期Anderson模型，该模型包含了传导电子和定域电子之间依赖于位置的反对称自旋轨道耦合。结果表明，在平均场近似下，该模型在具有中间杂化和电子关联的参数区域内表现出与六方铀化合物UNi4B一样的共面涡旋-晶格型磁序。这种特殊的状态适应了环形秩序，这导致了线性磁电效应。我们讨论了我们的结果对UNi4B的影响，重点讨论了与位置相关的反对称自旋-轨道耦合的可能来源。
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.