Large-area high-quality 2D ultrathin Mo2C superconducting crystals
Large-area high-quality 2D ultrathin Mo2C superconducting crystals
复制标题
大面积高质量二维超薄Mo2C超导晶体
DOI：
10.1038/nmat4374
复制
发表时间：
2015-11-01
期刊：
影响因子：
41.2
通讯作者：
Ren, Wencai
中科院分区：
文献类型：
--
作者：
Xu, Chuan;Wang, Libin;Ren, Wencai
过渡金属碳化物（TMCs）是一个具有许多有趣特性和应用的大家族材料，高质量的2D TMCs对于研究2D极限中的新物理和特性至关重要。然而，到目前为止获得的2D TMC是化学官能化的、有缺陷的纳米片，其最大横向尺寸类似于10 μ m。本文报道了用化学气相沉积法（CVD）制备大面积高质量二维α-Mo 2C晶体。晶体厚度为几纳米，尺寸超过100 μ m，在环境条件下非常稳定。它们表现出超导转变的二维特征，与Berezinskiii-Kosterlitz-无磁行为一致，并表现出强的各向异性与磁场取向;此外，超导性也强烈依赖于晶体厚度。我们的多功能CVD工艺允许制造其他高质量的2D TMC晶体，如Al 2 O3 WC和TaC晶体，这进一步扩展了2D材料的大家族。
Transition metal carbides (TMCs) are a large family of materials with many intriguing properties and applications, and high-quality 2D TMCs are essential for investigating new physics and properties in the 2D limit. However, the 2D TMCs obtained so far are chemically functionalized, defective nanosheets having maximum lateral dimensions of similar to 10 mu m. Here we report the fabrication of large-area high-quality 2D ultrathin alpha-Mo2C crystals by chemical vapour deposition (CVD). The crystals are a few nanometres thick, over 100 mu m in size, and very stable under ambient conditions. They show 2D characteristics of superconducting transitions that are consistent with Berezinskii-Kosterlitz-Thouless behaviour and show strong anisotropy with magnetic field orientation; moreover, the superconductivity is also strongly dependent on the crystal thickness. Our versatile CVD process allows the fabrication of other high-quality 2D TMC crystals, such as ultrathin WC and TaC crystals, which further expand the large family of 2D materials.