Superconductivity in ThMo2Si2C with Mo2C square net

• Published in: Science China. Physics, mechanics & astronomy Vol. 64; no. 7; p. 277411
• Main Authors: Liu, ZiChen, Li, BaiZhuo, Xiao, YuSen, Duan, QingChen, Cui, YanWei, Mei, YuXue, Tao, Qian, Wei, ShuLi, Tan, ShuGang, Jing, Qiang, Lu, Qing, Sun, YuPing, Liu, YunYan, Fu, ShengGui, Jiang, Hao, Ren, Zhi, Xu, ZhuAn, Wang, Cao, Cao, GuangHan
• Format: Journal Article
• Language: English
• Published: Beijing Science China Press 01.07.2021; Springer Nature B.V
• Subjects: Astronomy; Classical and Continuum Physics; Coherence length; Crystal structure; Electric arc melting; Electrical resistivity; Electrons; Energy gap; Interlayers; Magnetic fields; Magnetic permeability; Observations and Techniques; Parameters; Penetration depth; Physics; Physics and Astronomy; Superconductivity; physical properties; superconductivity; quaternary compound
• ISSN: 1674-7348; 1869-1927
• DOI: 10.1007/s11433-021-1698-3

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 Å and c = 5.3571 Å. 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 Δ C/γ n T = 0.98. The superconducting parameters of the critical magnetic fields, coherence length, penetration depth, and superconducting energy gap are given.