论文标题
金属 - 绝缘体过渡和异常晶格参数变化Ru掺杂的VO2
Metal-Insulator Transition and Anomalous Lattice Parameters Changes in Ru-doped VO2
论文作者
论文摘要
由于其现象学和潜在的应用，几十年来感兴趣的VO2在环境温度下具有金红石晶体结构的单斜畸变，并与其金属绝缘体转变（MIT）耦合。相比之下，RUO2每个配方单元具有更多的三个电子，是一个金属导体，具有未变的金红石结构。在这里，我们报告了RU掺杂VO2的系统研究（V1-XRUXO2）；通常表征其晶体结构，磁性和电子特性以及热容量。确定依赖组成的威尔逊比率。我们发现需要异常高的RU掺杂值（X = 0.8）才能在V1-Xruxo2中获得金属状态。在金属材料中，未观察到超导性下降到0.1 K。我们提出了可能了解在高ru内容处的v1-xruxo2中如何存在绝缘状态的可能理解。
VO2, of interest for decades due to both its phenomenology and its potential applications, has a monoclinic distortion of the rutile crystal structure at ambient temperature that is coupled to its metal-insulator transition (MIT). In contrast, RuO2 has three electrons more per formula unit, is a metallic conductor, and has an undistorted rutile structure. Here we report a systematic study of Ru-doped VO2 (V1-xRuxO2); generally characterizing its crystal structure, magnetic and electronic properties, and heat capacity. The composition-dependent Wilson ratio is determined. We find that an unusually high Ru doping value (x=0.8) is required to achieve a metallic state in V1-xRuxO2. No superconductivity was observed down to 0.1 K in the metallic materials. We propose a possible understanding for how the insulating state can exist in V1-xRuxO2 at high Ru contents.
