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arXiv · 2104.09822

Superconductivity in ThMo2Si2C with Mo2C Square Net

Zichen Liu·Baizhuo Li·Yusen Xiao·Qingchen Duan·Yanwei Cui·YuXue Mei·Qian Tao·Shuli Wei·Shugang Tan·Qiang Jing·Qing Lu·Yuping Sun·Yunyan Liu·Shenggui Fu·Hao Jiang·Zhi Ren·Zhu'an Xu·Cao Wang·Guanghan Cao
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Abstract

We report the superconductivity of a new quaternary compound ThMo$_2$Si$_2$C, synthesized with the arc-melting technique. The compound crystallizes in a tetragonal CeCr$_2$Si$_2$C-type structure with cell parameters of $a$ = 4.2296 \r{A}and $c$ = 5.3571 \r{A}. An interlayer Si-Si covalent bonding is suggested by the atomic distance. The electrical resistivity and magnetic susceptibility measurements indicate a Pauli-paramagnetic metal with dominant electron-electron scattering in the normal-state. Bulk superconductivity at 2.2 K is demonstrated with a dimensionless specific-heat jump of ${\Delta}C/\gamma_{\rm n}T$ = 0.98. The superconducting parameters of the critical magnetic fields, coherence length, penetration depth, and superconducting energy gap are given.

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Zichen Liu, Baizhuo Li, Yusen Xiao, Qingchen Duan, Yanwei Cui, YuXue Mei, Qian Tao, Shuli Wei, Shugang Tan, Qiang Jing, Qing Lu, Yuping Sun, Yunyan Liu, Shenggui Fu, Hao Jiang, Zhi Ren, Zhu'an Xu, Cao Wang, Guanghan Cao. 2021-04-20. Superconductivity in ThMo2Si2C with Mo2C Square Net. https://doi.org/10.1007/s11433-021-1698-3

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