The synthesis and characterization of a new compound Mg4Pd7As6, which is found to be a superconductor with Tc = 5.45 K is reported. Powder X‐ray diffraction confirms the U4Re7Si6 structure (space group Im‐3m, no. 229) with the lattice parameter a = 8.2572(1) Å. Magnetization, specific heat, and electrical resistivity measurements indicate that it is a moderate‐coupling (λ = 0.72) type‐II superconductor. The electronic and phonon structures are calculated, highlighting the importance of antibonding Pd–As interactions in determining the properties of this material. The calculated electron–phonon coupling parameter λ = 0.76 agrees very well with the experimental finding, which confirms the conventional pairing mechanism in Mg4Pd7As6.

中文翻译：

---

三元 Mg4Pd7As6 中的超导性


报道了一种新化合物 Mg4Pd7As6 的合成和表征，该化合物被发现是 Tc = 5.45 K 的超导体。粉末 X 射线衍射证实了 U4Re7Si6 结构（空间群 Im-3m，编号 229），晶格参数 a = 8.2572（1） Å。磁化强度、比热和电阻率测量表明，它是一种中等耦合 （λ = 0.72） 的 II 型超导体。计算了电子和声子结构，突出了反键 Pd-As 相互作用在确定该材料性能方面的重要性。计算出的电子-声子耦合参数 λ = 0.76 与实验结果非常吻合，这证实了 Mg4Pd7As6 中的常规配对机制。