Cation Dimerization in a 3d1 Honeycomb Lattice System.
Cation Dimerization in a 3d1 Honeycomb Lattice System.
复制标题
3d1 蜂窝晶格系统中的阳离子二聚。
DOI：
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发表时间：
2021
影响因子：
15
通讯作者：
H. Kimura
中科院分区：
文献类型：
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作者：
Hajime Yamamoto;Sachiko Kamiyama;I. Yamada;H. Kimura
在具有部分填充价带的一维系统中，电子态和晶体结构同时发生变化。这称为佩尔斯转变。具有准一维结构的VO2中的Peierls转变（阳离子二聚化）是众所周知的，其机制已被广泛讨论。蜂窝晶格由于其低维数而表现出 Peierls 不稳定性。然而，在 3d1 蜂窝晶格系统中，阳离子二聚很少见。在这里，我们对钛铁矿型 MgVO3（3d1 蜂窝晶格系统）中的 V-V 二聚（V-V 直接键的形成）进行了深入研究。通过同步加速器 X 射线实验，在低于 500 K 的温度下，在 V-V 二聚体中观察到梯状图案。这种二聚化伴随着磁性到非磁性的转变。此外，价键液相可能在 500-600 K 下存在。我们的结果揭示了 3d1 蜂窝晶格系统中价电子的行为。
In one-dimensional systems with partially filled valence bands, simultaneous changes occur in the electronic states and crystal structures. This is known as the Peierls transition. The Peierls transition (cation dimerization) in VO2, which has a quasi-one-dimensional structure, is well-known, and its mechanism has been extensively discussed. Honeycomb lattices exhibit the Peierls instability owing to their low dimensionality. However, cation dimerization is rare in the 3d1 honeycomb lattice system. Here, we perform an in-depth examination of the V-V dimerization (formation of V-V direct bond) in ilmenite-type MgVO3, which is a 3d1 honeycomb lattice system. A ladderlike pattern was observed in the V-V dimers through synchrotron X-ray experiments at temperatures below 500 K. This dimerization was accompanied by a magnetic-to-nonmagnetic transition. Moreover, a valence bond liquid phase may exist at 500-600 K. Our results reveal the behavior of the valence electrons in the 3d1 honeycomb lattice system.
DOI：
10.1073/pnas.1606367113
发表时间：
2016-02
期刊：
Proceedings of the National Academy of Sciences
影响因子：
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作者：
S. Streltsov;D. Khomskii
通讯作者：
S. Streltsov;D. Khomskii