Ruan Bin-Bin, Sun Jun-Nan, Zhou Meng-Hu, Yang Qing-Song, Gu Ya-Dong, Chen Gen-Fu, Shan Lei, Ren Zhi-An
Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China.
Inorg Chem. 2022 Jul 11;61(27):10267-10271. doi: 10.1021/acs.inorgchem.2c01647. Epub 2022 Jun 28.
Arsenic doping in silicides has been much less studied compared with phosphorus. In this study, superconductivity is successfully induced by As doping in MoSi. The superconducting transition temperature () reaches 7.7 K, which is higher than those in previously known WSi-type superconductors. MoSiAs is a type-II BCS superconductor with upper and lower critical fields of 6.65 T and 22.4 mT, respectively. In addition, As atoms are found to selectively take the 8 sites in MoSiAs. The emergence of superconductivity is possibly due to the shift of Fermi level as a consequence of As doping, as revealed by the specific heat measurements and first-principles calculations. Our work provides not only another example of As doping but also a practical strategy to achieve superconductivity in silicides through Fermi level engineering.
与磷相比，硅化物中的砷掺杂研究要少得多。在本研究中，通过在MoSi中进行As掺杂成功诱导出了超导性。超导转变温度（）达到7.7 K，高于先前已知的WSi型超导体。MoSiAs是一种II型BCS超导体，其上下临界场分别为6.65 T和22.4 mT。此外，发现As原子在MoSiAs中选择性占据8个位置。比热测量和第一性原理计算表明，超导性的出现可能是由于As掺杂导致费米能级的移动。我们的工作不仅提供了As掺杂的另一个例子，还提供了一种通过费米能级工程在硅化物中实现超导性的实用策略。
