Here we report the discovery of the first ternary molybdenum pnictide based superconductor K₂Mo₃As₃. Polycrystalline samples were synthesized by the conventional solid state reaction method. X-ray diffraction analysis reveals a quasi-one-dimensional hexagonal crystal structure with (Mo₃As₃)²⁻ linear chains separated by K⁺ ions, similar as previously reported K₂Cr₃As₃, with the space group of P-6m2 (No. 187) and the refined lattice parameters a = 10.145(5) Å and c = 4.453(8) Å. Electrical resistivity, magnetic susceptibility, and heat capacity measurements exhibit bulk superconductivity with the onset T_c at 10.4 K in K₂Mo₃As₃ which is higher than the isostructural Cr-based superconductors. Being the same group VIB transition elements and with similar structural motifs, these Cr and Mo based superconductors may share some common underlying origins for the occurrence of superconductivity and need more investigations to uncover the electron pairing within a quasi-one-dimensional chain structure.

在这里，我们报告了第一个基于三元钼元素的超导体 K ₂ Mo ₃ As ₃的发现。通过常规的固态反应方法合成多晶样品。X 射线衍射分析显示准一维六方晶体结构，具有 (Mo ₃ As ₃ ) ²⁻线性链，由 K ⁺离子分隔，类似于先前报道的 K ₂ Cr ₃ As ₃，空间群为P - 6 m 2 (No. 187) 和细化晶格参数a  = 10.145(5) Å 和c = 4.453(8) 埃。电阻率、磁化率和热容量测量显示体积超导性，在 K ₂ Mo ₃ As _3中起始Tc为 10.4 K，高于等结构 Cr 基超导体。作为同族 VIB 过渡元素和相似的结构基序，这些基于 Cr 和 Mo 的超导体可能具有一些共同的超导发生的潜在起源，需要更多的研究来揭示准一维链结构中的电子配对。