Short-range order and increased transition temperature in LiVO2 with weakened trimer frustration
Short-range order and increased transition temperature in LiVO2 with weakened trimer frustration
复制标题
LiVO2 中的短程有序和转变温度升高，三聚体挫败减弱
DOI：
10.1103/physrevb.107.l020101
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发表时间：
2023
影响因子：
3.7
通讯作者：
Sawa H.
中科院分区：
文献类型：
--
作者：
Kojima K.;Katayama N.;Matsuda Y.;Shiomi M.;Ishii R.;Sawa H.
层状钒原子在低温下形成面内周期性的钒三聚体，但由于存在许多具有可比晶格能的三聚体构型，因此三聚体在堆叠方向上随机出现。我们详细介绍了一个原始的建模方案，以代表玻璃态的堆叠结构中的完全无序的三聚体配置。通过对分布函数分析，我们表明，该合成方法可以产生两种类型的低温堆叠结构：一个完全无序的堆叠结构和短程有序的堆叠结构。前者的相变温度比后者低约15 K。我们讨论，这是由于强烈的三聚体挫折，出现在样品中没有短程有序，这抑制了相变温度，类似于传统的自旋系统中的挫折效应。
Vanadium atoms in layeredform in-plane periodic vanadium trimers at low temperatures, but the trimers appear randomly in the stacking direction because there are many trimer configurations with comparable lattice energy. We detailed an original modeling scheme to represent glassy states with a completely disordered trimer configuration in the stacking structure. Through pair distribution function analysis using this model, we show that the synthesis method can yield two types of low-temperature stacking structures: a completely disordered stacking structure and a short-range order in the stacking structure. The phase-transition temperature of the former sample is about 15 K lower than that of the latter. We discuss that this is due to the strong trimer frustration that appears in the sample without short-range order, which suppresses the phase-transition temperature, similar to the frustration effect in conventional spin systems.