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在蜂巢网格上对竞争相互作用的压力调整
Piyush Sakrikar1, Bin Shen2, Eduardo H T Poldi3,4
1Department of Physics, Boston College, Chestnut Hill, MA, 02467, USA.
Nature communications
|May 21, 2025
概括
对Ag3LiRh2O6施加压力,通过调整海森堡 (J) 和基塔耶夫 (K) 交换相互作用之间的平衡来抑制其磁性排序温度. 这种调整将材料驱动到一个量子临界点,而无需结构二元化.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 量子磁力 量子磁力 量子磁力
背景情况:
- 由轨道重叠介导的交换相互作用,控制材料中的磁性.
- 通过压力或应变调整粘合角度可以改变竞争磁相互作用的平衡.
- 蜂格子材料对实现像自旋液体这样的异国情调磁相很感兴趣.
研究的目的:
- 为了研究压力对Ag3LiRh2O6中的磁交换相互作用的影响,一个旋转-1/2蜂格子材料.
- 要了解压力如何改变海森堡 (J) 和基塔耶夫 (K) 合器的比率.
- 为了探索磁性秩序的调整和接近压力下的量子临界点.
主要方法:
- 在变压下对磁性订序温度 (尼尔温度,TN) 的实验测量.
- 对X射线衍射数据的分析,以探测由压力引起的结构变化.
- 第一个原则计算,以确定压力对债券角度和交换相互作用的影响.
- 子自旋放松 (μSR) 光谱检测不同压力和温度下磁力学动态.
主要成果:
- 在Ag3LiRh2O6.6中观察到随着压力增加而快速抑制尼尔温度 (TN).
- 发现压力修改了结合角度,导致K/J结合率增加,从而抑制TN.
- 子自旋放松 (μSR) 数据显示了在低压和高压下TN以下的明显磁性行为,表明磁相互作用的转变.
结论:
- 压力有效调整了Ag3LiRh2O6中的Kitaev-Heisenberg交换比,抑制了磁性秩序.
- 该材料被压力驱动到量子临界点,与其他基塔耶夫材料候选物质不同.
- Ag3LiRh2O6提供了一个独特的平台,可以在没有有害的结构二元化的情况下研究压力调节的量子磁力.
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