Slow dynamics of disordered zigzag chain molecules in layered LiVS2 under electron irradiation
Slow dynamics of disordered zigzag chain molecules in layered LiVS2 under electron irradiation
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DOI：
10.1038/s41535-021-00313-w
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发表时间：
2021-02
影响因子：
5.7
通讯作者：
N. Katayama;K. Kojima;Tomoki Yamaguchi;Sosuke Hattori;S. Tamura;K. Ohara;Shintaro Kobayashi;K. Sugimoto;Y. Ohta;K. Saitoh;H. Sawa
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作者：
N. Katayama;K. Kojima;Tomoki Yamaguchi;Sosuke Hattori;S. Tamura;K. Ohara;Shintaro Kobayashi;K. Sugimoto;Y. Ohta;K. Saitoh;H. Sawa
过渡金属化合物中的电子不稳定性在低温下常常自发地形成轨道分子，这些轨道分子由轨道耦合的金属离子组成。最近的本地结构研究利用对分布函数显示，预制的轨道分子出现无序，即使在高温顺磁相。然而，目前还不清楚预先形成的轨道分子是动态的还是静态的。在这里，我们提供了明确的实验证据的无序轨道分子的缓慢动力学实现在高温顺磁相的LiVS 2，它表现出钒三聚冷却后低于314 K。出乎意料的是，预先形成的轨道分子呈现为无序的锯齿形链，在电子照射下在时间和空间上波动。我们的研究结果应该推进软物质物理学的研究实现在无机材料由于无序轨道分子。
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.