论文标题
3D过渡金属化合物中的Kitaev自旋液体
Kitaev Spin Liquid in 3d Transition Metal Compounds
论文作者
论文摘要
我们研究了蜂窝状架的交换相互作用和产生的磁相。对于作用于二氧化碳+离子的各种三角晶体，低能量的假蛋白-1/2汉密尔顿人以构成Kitaev模型的键依赖性的Ising耦合为主。非基塔伊夫（Non-Kitaev）术语几乎在三角球场δ值的小值下几乎消失，从而导致液态基态旋转。以Na3Co2SBO6为例，我们发现该化合物与Kitaev旋转液相很接近，并且可以通过稍微降低ΔBY\ SIM \ SIM 20 MEV（例如，通过应变或压力控制）将其驱动到其中。我们认为，由于3D化合物中磁性电子的本地化性质更高，因此钴虫为Kitaev模型物理学提供了最有希望的搜索区域。
We study the exchange interactions and resulting magnetic phases in the honeycomb cobaltates. For a broad range of trigonal crystal fields acting on Co2+ ions, the low-energy pseudospin-1/2 Hamiltonian is dominated by bond-dependent Ising couplings that constitute the Kitaev model. The non-Kitaev terms nearly vanish at small values of trigonal field Δ, resulting in spin liquid ground state. Considering Na3Co2SbO6 as an example, we find that this compound is proximate to a Kitaev spin liquid phase, and can be driven into it by slightly reducing Δby \sim 20 meV, e.g., via strain or pressure control. We argue that due to the more localized nature of the magnetic electrons in 3d compounds, cobaltates offer the most promising search area for Kitaev model physics.
