Superconductivity in ThMo2Si2C with Mo2C square net

ThCr2Si2C: An Antiferromagnetic Metal with a Cr2C Square Lattice

“…The resistivity at 300 K is 1.08 mΩ·cm. This value is close to ThMo 2 Si 2 C, and is nearly 1 order of magnitude larger than that of CeCr 2 Si 2 C single crystal . The resistivity showed no anomaly at 2–390 K. The resistivity below 50 K can be well fitted using the equation ρ­( T ) = ρ 0 + AT 2 .…”

“…Recently, we reported a new superconductor, ThMo 2 Si 2 C, with a critical temperature of 2.2 K. The conducting Mo 2 Si 2 C layer in ThMo 2 Si 2 C exhibits an isostructural relationship with the Ti 2 Pn 2 O layers found in previously discovered BaTi 2 Pn 2 O ( Pn = Sb, Bi) superconductors. , First-principles calculations have demonstrated that the density of states near the Fermi surface in ThMo 2 Si 2 C is primarily contributed by the Mo 4d orbital . Notably, ThMo 2 Si 2 C is the only superconducting member among the R Mo 2 Si 2 C family ( R represents rare earth elements), while others containing lanthanide elements ( Ln Mo 2 Si 2 C) behave as nonsuperconducting metals and exhibit Pauli paramagnetism. , This observation suggests that the superconductivity in ThMo 2 Si 2 C may be associated with the band-filling effects on the Mo 4d orbital resulting from the substitution of Th 4+ for Ln 3+ . On the other hand, the Cr-based analogues Ln Cr 2 Si 2 C featuring Cr 3d electrons display similar Pauli paramagnetic behavior as the Ln Mo 2 Si 2 C compounds. − Given the unique superconductivity observed in ThMo 2 Si 2 C, it is of great interest to investigate its Cr-based analogue, ThCr 2 Si 2 C, to study the effects of band filling on the Cr 3d orbital.…”

“…13,14 This observation suggests that the superconductivity in ThMo 2 Si 2 C may be associated with the band-filling effects on the Mo 4d orbital resulting from the substitution of Th 4+ for Ln 3+ . 11 On the other hand, the Cr-based analogues LnCr 2 Si 2 C featuring Cr 3d electrons display similar Pauli paramagnetic behavior as the LnMo 2 Si 2 C compounds. 15−19 Given the unique superconductivity observed in ThMo 2 Si 2 C, it is of great interest to investigate its Crbased analogue, ThCr 2 Si 2 C, to study the effects of band filling on the Cr 3d orbital.…”

“…Recently, we reported a new superconductor, ThMo 2 Si 2 C, with a critical temperature of 2.2 K. The conducting Mo 2 Si 2 C layer in ThMo 2 Si 2 C exhibits an isostructural relationship with the Ti 2 Pn 2 O layers found in previously discovered BaTi 2 Pn 2 O (Pn = Sb, Bi) superconductors. 10,11 First-principles calculations have demonstrated that the density of states near the Fermi surface in ThMo 2 Si 2 C is primarily contributed by the Mo 4d orbital. 12 Notably, ThMo 2 Si 2 C is the only superconducting member among the RMo 2 Si 2 C family (R represents rare earth elements), while others containing lanthanide elements (LnMo 2 Si 2 C) behave as nonsuperconducting metals and exhibit Pauli paramagnetism.…”

The chemical states and electronic states of layered carbide superconductor ThMo2Si2C

“…Recently, a new quaternary compound superconductor ThMo 2 Si 2 C has been discovered by us. It owns a tetragonal CeCr 2 Si 2 C-type structure with T c = 2.2 K. In this superconductor, the Mo-Si-C layer and Th layer are alternatively stacked along the c-axis too, but there is a strong interaction between Si atoms of different layers (as shown in figure 1(a)) [7]. This strong interaction between layers may influence the transportation of electrons in the superconducting layer.…”