Nematicity and fractional magnetization plateaus induced by spin-lattice coupling in the classical kagome-lattice Heisenberg antiferromagnet
Nematicity and fractional magnetization plateaus induced by spin-lattice coupling in the classical kagome-lattice Heisenberg antiferromagnet
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DOI：
10.1103/physrevb.105.174424
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发表时间：
2022-05-20
影响因子：
3.7
通讯作者：
Suwa, Hidemaro
中科院分区：
文献类型：
--
作者：
Gen, Masaki;Suwa, Hidemaro
我们使用改进的蒙特卡罗更新研究了自旋晶格耦合 (SLC) 对经典 kagomelattice 海森堡反铁磁体 (KHAF) 磁性的影响。晶格模式由爱因斯坦位点声子表示，除了最近邻双二次相互作用之外，还引入了有效的远邻自旋相互作用。在弱 SLC 中，宏观简并共面基态保持在零场，而外部磁场中出现 3 x 3 有序相并伴有 1/3 磁化平台。在强 SLC 中，我们发现零场处有向列序，以及与 3 x 3 共线序相关的 1/9 磁化平台。在 1/9 和 1/3 平台态之间的相变附近，单次自旋翻转的遍历性几乎被破坏，并且出现缓慢的动力学。我们建议具有强 SLC 的相关 KHAF 将在尖晶石基材料中实现。
We investigate the effect of spin-lattice coupling (SLC) on the magnetic properties of the classical kagomelattice Heisenberg antiferromagnet (KHAF) using improved Monte Carlo updates. The lattice modes are represented by Einstein site phonons, which introduce effective further-neighbor spin interactions in addition to the nearest-neighbor biquadratic interactions. In the weak SLC, the macroscopically degenerate coplanar ground state remains at zero field, while a 3 x 3 ordered phase accompanied by a 1/3-magnetization plateau appears in external magnetic fields. In the strong SLC, we find a nematic order at zero field and a 1/9-magnetization plateau associated with a 3 x 3 collinear order. Near the phase transition between the 1/9- and 1/3-plateau states, the ergodicity in the single spin flip is practically broken, and slow dynamics appear. We propose that relevant KHAFs with strong SLC would be realized in spinel-based materials.