论文标题
BACO $ _2 $（ASO $ _4 $）$ _ 2 $中的几何挫败感与Kitaev互动
Geometrical frustration versus Kitaev interactions in BaCo$_2$(AsO$_4$)$_2$
论文作者
论文摘要
最近，已经提出了基于CO的蜂窝磁铁作为有前途的候选材料，用于托管Kitaev旋转液态。领先者之一是baco $ _2 $（ASO $ _4 $）$ _ 2 $（BCAO），建议通过周围的边缘氧气氧气octygen oct oct co $^{2+} $ ions之间的交换过程可以引起债券依赖的Kitaev kitaev互动。在这项工作中，我们介绍并分析了BCAO的全面非弹性中子散射研究，该研究与蜂窝平面中的田间。在高场极化状态和零磁场中测得的非弹性自旋结构因子中，从磁通激发中结合了约束，我们检查了两个主要的理论模型：Kitaev-type \ JKG模型和\ XXZ模型。我们表明，现有的实验数据可以由\ XXZ模型始终如一地解释，而不是\ jkg模型，我们讨论了这些结果对实现BCAO中旋转液相的含义，并且更普遍地在cobaltates中实现了基塔伊夫模型。
Recently, Co-based honeycomb magnets have been proposed as promising candidate materials to host the Kitaev spin liquid state. One of the front-runners is BaCo$_2$(AsO$_4$)$_2$ (BCAO), where it was suggested that the exchange processes between Co$^{2+}$ ions via the surrounding edge-sharing oxygen octahedra could give rise to bond-dependent Kitaev interactions. In this work, we present and analyze comprehensive inelastic neutron scattering studies of BCAO with fields in the honeycomb plane. Combining the constraints from the magnon excitations in the high-field polarized state and the inelastic spin structure factor measured in zero magnetic field, we examine two leading theoretical models: the Kitaev-type \JKG model and the \XXZ model. We show that the existing experimental data can be consistently accounted for by the \XXZ model but not by the \JKG model, and we discuss the implications of these results for the realization of a spin liquid phase in BCAO and more generally for the realization of the Kitaev model in cobaltates.
