论文标题
在金属naru $ _2 $ o $ _4 $中共存的Z型费用和债券订单
Coexisting Z-type charge and bond order in metallic NaRu$_2$O$_4$
论文作者
论文摘要
量子材料中的特定键是一个长期存在的难题。涉及电荷自由度的两个关键概念是二聚化（形成金属金属键）和电荷顺序（CO）。自1930年代以来，这两个概念经常被调用，以解释许多令人兴奋的量子材料，通常是绝缘子。在这里，我们在金属naru $ _2 $ o $ _4 $中共存的二聚体中报告二聚化和CO。通过将高分辨率X射线衍射研究和理论计算结合在一起，我们证明了这种独特的现象是通过新型的键合发生的，我们称之为Z型排序。低温上层建筑在锯齿形梯子的腿的腿上具有强大的二聚化，腿部短二聚体通过短的曲折键连接，形成Z形簇：同时出现，以场地为中心的填充排序。我们的结果表明，量子材料的灵活性却未知，轨道，电荷和晶格自由度之间的复杂相互作用。
How particular bonds form in quantum materials has been a long-standing puzzle. Two key concepts dealing with charge degrees of freedom are dimerization (forming metal-metal bonds) and charge ordering (CO). Since the 1930s, these two concepts have been frequently invoked to explain numerous exciting quantum materials, typically insulators. Here we report dimerization and CO within the dimers coexisting in metallic NaRu$_2$O$_4$. By combining high-resolution x-ray diffraction studies and theoretical calculations, we demonstrate that this unique phenomenon occurs through a new type of bonding, which we call Z-type ordering. The low-temperature superstructure has strong dimerization in legs of zigzag ladders, with short dimers in legs connected by short zigzag bonds, forming Z-shape clusters: simultaneously, site-centered charge ordering also appears. Our results demonstrate the yet unknown flexibility of quantum materials with the intricate interplay among orbital, charge, and lattice degrees of freedom.
