Superconductivity at 10.4 K in a novel quasi-one-dimensional ternary molybdenum pnictide K2Mo3As3

Abstract

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 Tc 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.

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• Structural Instability and Magnetism of Superconducting KCr${}_3$As${}_3$
• K2Mo3As3 is a Multi-Gap Electron-Phonon Superconductor
• Singlet $s^{\pm }$-wave pairing in quasi-one-dimensional ACr${}_3$As${}_3$ (A=K, Rb, Cs) superconductors
• Superconductivity with a Violation of Pauli Limit and Evidences for Multigap in $\eta$-Carbide type Ti${}_4$Ir${}_2$O
• Theoretical study of dynamical and electronic properties of noncentrosymmetric superconductor NbReSi
• Gapless spin-excitations in the superconducting state of a quasi-one-dimensional spin-triplet superconductor
• Multiband superconductivity and possible nodal gap in RbCr${}_3$As${}_3$ revealed by Andreev reflection and single-particle tunneling measurements
• Superconductivity in novel quasi-one-dimensional ternary molybdenum pnictides Rb2Mo3As3 and Cs2Mo3As3
• Superconductivity in the regime of attractive interactions in the Tomonaga-Luttinger liquid
• Reemergence of superconductivity in pressurized quasi-one-dimensional superconductor K2Mo3As3
• Lifshitz transition enhanced triplet $p_z$-wave superconductivity in hydrogen doped KCr${}_3$As${}_3$
• Superconductivity Induced by Site-Selective Arsenic Doping in Mo${}_5$Si${}_3$
• The pairing symmetry in quasi-one-dimensional superconductor Rb2Mo3As3
• Magnetic instabilities in quasi-one-dimensional Cr-based material
• Hydrogen Doping Induced $p_x\pm i{p}_y$ Triplet Superconductivity in Quasi-One-Dimensional K${}_2$Cr${}_3$As${}_3$