We report for the first time the occurrence of superconductivity in the quaternary silicide carbide YRe₂SiC with T _c ≈ 5.9 K. The emergence of superconductivity was confirmed by means of magnetic susceptibility, electrical resistivity, and heat capacity measurements. The presence of a well-developed heat capacity feature at T _c confirms that superconductivity is a bulk phenomenon, while a second feature in the heat capacity near 0.5T _c combined with the unusual temperature dependence of the upper critical field H _c2(T) indicate the presence of a multiband superconducting state. Additionally, the linear dependence of the lower critical field H _c1 with temperature resemble the behavior found in compounds with unconventional pairing symmetry. Band structure calculations reveal that YRe₂SiC could harbor a non-trivial topological state and that the low-energy states occupy multiple disconnected sheets at the Fermi surface, with different degrees of hybridization, nesting, and screening effects, therefore making unconventional multiband superconductivity plausible.

我们首次报告了T _c ≈ 5.9 K的四元碳化硅化物 YRe ₂ SiC中超导性的发生。通过磁化率、电阻率和热容测量证实了超导性的出现。在T _c处存在完善的热容量特征证实了超导性是一种本体现象，而在接近 0.5 T _c的热容量中的第二个特征与上临界场H _c2 ( T ) 表示存在多波段超导状态。此外，下临界场H _c1与温度的线性相关性类似于在具有非常规配对对称性的化合物中发现的行为。能带结构计算表明，YRe ₂ SiC 可能具有非平凡的拓扑态，并且低能态在费米表面占据多个不连续的薄片，具有不同程度的杂化、嵌套和屏蔽效应，因此使得非常规多带超导性变得合理.