A New Quasi-One-Dimensional Ternary Molybdenum Pnictide Rb$_{2}$Mo$_{3}$As$_{3}$ with Superconducting Transition at 10.5 K
Kang Zhao1,2 , Qing-Ge Mu1,2 , Bin-Bin Ruan1,2,3 , Meng-Hu Zhou1,2,3 , Qing-Song Yang1,2 , Tong Liu1,2 , Bo-Jin Pan1,2 , Shuai Zhang1,2 , Gen-Fu Chen1,2,3 , and Zhi-An Ren1,2,3*
1 Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China3 Songshan Lake Materials Laboratory, Dongguan 523808, China
Abstract ：We report superconductivity in a new ternary molybdenum pnictide Rb$_{2}$Mo$_{3}$As$_{3}$, synthesized via the solid state reaction method. Powder x-ray diffraction analysis reveals a hexagonal crystal structure with space group $P\bar{6}m2$ (No. 187), and the refined lattice parameters are $a = 10.431(5)$ Å, $c = 4.460(4)$ Å. SEM images show rod-like grains with good ductility, confirming a quasi-one-dimensional (Q1D) structure. Electrical resistivity and dc magnetic susceptibility characterizations exhibit superconductivity with an onset of $T_{\rm c}=10.5$ K. The upper critical field of Rb$_{2}$Mo$_{3}$As$_{3}$ is estimated to be 28.2 T at zero temperature, providing an evidence of possible unconventional superconductivity. Our recent discovery of MoAs-based superconductors above 10 K provides a unique platform for the study of exotic superconductivity in $4d$ electron systems with Q1D crystal structures.
收稿日期: 2020-06-17
出版日期: 2020-09-01
:
74.70.Dd
(Ternary, quaternary, and multinary compounds)
74.62.Bf
(Effects of material synthesis, crystal structure, and chemical composition)
74.70.-b
(Superconducting materials other than cuprates)
引用本文:
. [J]. 中国物理快报, 2020, 37(9): 97401-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/37/9/097401
或
https://cpl.iphy.ac.cn/CN/Y2020/V37/I9/97401
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2020, Vol. 37 
