Superconductivity in ThMo2Si2C with Mo2C Square Net

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 Åand $c$ = 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 $\Delta C/{\gamma }_{\mathrm{n}}T$ = 0.98. The superconducting parameters of the critical magnetic fields, coherence length, penetration depth, and superconducting energy gap are given.

arXiv comment14 pages, 6 figures, 3 tables. Accepted for publication in SCIENCE CHINA Physics, Mechanics & Astronomy

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