论文标题
低温下Na2Co2Teo6的自旋轨道相行为
Spin-orbit phase behaviors of Na2Co2TeO6 at low temperatures
论文作者
论文摘要
我们提出了一项全面的研究，该研究是一种推定的Kitaev蜂窝磁铁Na2Co2Teo6的单晶，重点是其低温相。在31.0 K下鉴定出新的热相变，在该系统下方会发展二维（2D）远程磁性。该顺序先于26.7 K以下著名的3D顺序，并且很可能是由各向异性相互作用驱动的。令人惊讶的是，来自3D顺序的激发不支持该订单通常接受的“曲折”性质，而是与“ Triple-Q”描述一致。 3D订单对可能涉及轨道自由度的高能激发产生了基本反馈，直到达到温度降低得多，它一直高度沮丧。这些发现使Na2Co2Teo6一种旋转轨道纠缠的沮丧磁铁，可容纳非常丰富的物理学。
We present a comprehensive study of single crystals of Na2Co2TeO6, a putative Kitaev honeycomb magnet, focusing on its low-temperature phase behaviors. A new thermal phase transition is identified at 31.0 K, below which the system develops a two-dimensional (2D) long-range magnetic order. This order precedes the well-known 3D order below 26.7 K, and is likely driven by strongly anisotropic interactions. Surprisingly, excitations from the 3D order do not support the order's commonly accepted "zigzag" nature, and are instead consistent with a "triple-q" description. The 3D order exerts a fundamental feedback on high-energy excitations that likely involve orbital degrees of freedom, and it remains highly frustrated until a much lower temperature is reached. These findings render Na2Co2TeO6 a spin-orbit entangled frustrated magnet that hosts very rich physics.
