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Slow dynamics of disordered zigzag chain molecules in layered LiVS 2 under electron irradiation
npj Quantum Materials ( IF 5.7 ) Pub Date : 2021-02-18 , DOI: 10.1038/s41535-021-00313-w
Naoyuki Katayama , Keita Kojima , Tomoki Yamaguchi , Sosuke Hattori , Shinya Tamura , Koji Ohara , Shintaro Kobayashi , Koudai Sugimoto , Yukinori Ohta , Koh Saitoh , Hiroshi Sawa

Electronic instabilities in transition metal compounds often spontaneously form orbital molecules, which consist of orbital-coupled metal ions at low temperature. Recent local structural studies utilizing the pair distribution function revealed that preformed orbital molecules appear disordered even in the high-temperature paramagnetic phase. However, it is unclear whether preformed orbital molecules are dynamic or static. Here, we provide clear experimental evidence of the slow dynamics of disordered orbital molecules realized in the high-temperature paramagnetic phase of LiVS2, which exhibits vanadium trimerization upon cooling below 314 K. Unexpectedly, the preformed orbital molecules appear as a disordered zigzag chain that fluctuate in both time and space under electron irradiation. Our findings should advance studies on soft matter physics realized in an inorganic material due to disordered orbital molecules.



中文翻译:

电子辐照下层状LiVS 2中无序之字形链分子的慢动力学

过渡金属化合物中的电子不稳定性通常会自发形成轨道分子,该分子由低温下的轨道耦合金属离子组成。最近利用对分布函数进行的局部结构研究表明,即使在高温顺磁相中,预先形成的轨道分子也显得无序。但是,尚不清楚预制的轨道分子是动态的还是静态的。在这里,我们提供了在LiVS 2的高温顺磁相中实现的无序轨道分子缓慢动力学的清晰实验证据。,在冷却至314 K以下时会表现出钒的三聚。出乎意料的是,预先形成的轨道分子表现为无序的之字形链,在电子辐照下在时间和空间上都有波动。我们的发现应促进对由于轨道分子无序而在无机材料中实现的软物质物理学的研究。

更新日期:2021-02-18
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