T. Hara, N. Katayama, S. Kitou, K. Kojima, S. Kawaguchi, H. Sawa
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引用次数: 0
摘要
我们对二维层状 1T-VSe2 进行了高压单晶 X 射线结构分析,已知其在 110 K 的环境压力下会发生不相称的电荷密度波转变。当在 150 K 时对 1T-VSe2 施压,在约 8 GPa 时会出现结构相变。对从单晶体样品中获得的 X 射线衍射数据进行结构分析后发现,在高压区域出现了 "带状链 "型钒簇。高压下 Se-Se 键的形成以及相关的意外电荷注入钒在很大程度上导致了带状链团簇的形成。我们讨论了这种阴离子间键的形成普遍发生在过渡金属二硒化物高压相中的可能性。
Pseudo-one-dimensional ribbon chain cluster realized under high pressure in 1T−VSe2
We present a high-pressure single-crystal x-ray structure analysis of two-dimensional layered , which is known to undergo an incommensurate charge density wave transition at 110 K at ambient pressure. When pressure is applied to at 150 K, a structural phase transition appears at about 8 GPa. The structural analysis of x-ray diffraction data obtained from a single crystal sample, with the correct corrections for the use of a diamond anvil cell and taking into account the effects of multiple domains, using only the superlattice peaks, reveals the appearance of “ribbon chain” type vanadium clusters at a high-pressure region. The formation of Se-Se bonds under high pressure and the associated unexpected charge injection into vanadium are largely responsible for the formation of ribbon-chain clusters. We discuss the possibility that such interanion bond formation occurs universally in the high-pressure phase of transition metal diserenides.
期刊介绍:
Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide.
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