| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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* |
1Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3Songshan Lake Materials Laboratory, Dongguan 523808, China
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| Cite this article: |
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Kang Zhao, Qing-Ge Mu, Bin-Bin Ruan et al 2020 Chin. Phys. Lett. 37 097401 |
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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.
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Received: 17 June 2020
Published: 01 September 2020
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| PACS: |
74.70.Dd
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(Ternary, quaternary, and multinary compounds)
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74.62.Bf
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(Effects of material synthesis, crystal structure, and chemical composition)
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74.70.-b
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(Superconducting materials other than cuprates)
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| Fund: Supported by the National Key Research and Development of China (Grant Nos. 2018YFA0704200 and 2016YFA0300301), the National Natural Science Foundation of China (Grant No. 11774402), and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB25000000). |
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