Ion-exchange synthesis and superconductivity at 8.6 K of Na2Cr3As3 with quasi-one-dimensional crystal structure

Abstract

A new Cr-based quasi-one-dimensional superconductor Na2Cr3As3 was synthesized by an ion-exchange method in sodium naphthalenide solution. The crystals are thread-like and the structure was analyzed by X-ray diffraction with a noncentrosymmetric hexagonal space group P-6m2 (No. 187), in which the (Cr3As3)2- linear chains are separated by Na+ ions, and the refined lattice parameters are a = 9.239(2) Å and c = 4.209(6) Å. The measurements for electrical resistivity, magnetic susceptibility, and heat capacity reveal a superconducting transition with unconventional characteristic at the Tc of 8.6 K, which exceeds that of all previously reported Cr-based superconductors.

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• NMR and NQR studies on transition-metal arsenide superconductors LaRu2As2, KCa2Fe4As4F2, and A2Cr3As3
• Coexistence of nontrivial topological properties and strong ferromagnetic fluctuations in $A_2$Cr${}_3$As${}_3$ ($A$=Na, K, Rb and Cs)
• Electronic structures of quasi-one-dimensional cuprate superconductors Ba${}_2$CuO${}_{3+\delta }$
• Frustrated structural instability in superconducting quasi-one-dimensional K${}_2$Cr${}_3$As${}_3$
• Tuning from Frustrated Magnetism to Superconductivity in Quasi-One-Dimensional KCr${}_3$As${}_3$ Through Hydrogen Doping
• A minimal tight-binding model for the quasi-one-dimensional superconductor K2Cr3As3
• Structural Instability and Magnetism of Superconducting KCr${}_3$As${}_3$
• Intra-chain collinear magnetism and inter-chain magnetic phases in Cr3As3-K-based materials
• Singlet $s^{\pm }$-wave pairing in quasi-one-dimensional ACr${}_3$As${}_3$ (A=K, Rb, Cs) superconductors
• Gapless spin-excitations in the superconducting state of a quasi-one-dimensional spin-triplet superconductor
• Tuning interchain ferromagnetic instability in A2Cr3As3 ternary arsenides by chemical pressure and uniaxial strain
• Multiband superconductivity and possible nodal gap in RbCr${}_3$As${}_3$ revealed by Andreev reflection and single-particle tunneling measurements
• Intrinsic topological superconductivity with exactly flat surface bands in the quasi-one-dimensional A${}_2$Cr${}_3$As${}_3$ (A=Na, K, Rb, Cs) superconductors
• Reemergence of superconductivity in pressurized quasi-one-dimensional superconductor K2Mo3As3
• Lifshitz transition enhanced triplet $p_z$-wave superconductivity in hydrogen doped KCr${}_3$As${}_3$
• Single crystal growth of and hyperfine couplings in the spin-triplet superconductor K${}_2$Cr${}_3$As${}_3$
• Interplay of Zeeman field, Rashba spin-orbit interaction, and superconductivity: Transition temperature and quasiparticle excitation
• Magnetic instabilities in quasi-one-dimensional Cr-based material
• Itinerant G-type antiferromagnet SrCr2As2 studied by magnetization, heat capacity, electrical resistivity, and NMR measurements
• The upper critical field and its anisotropy in RbCr${}_3$As${}_3$
• Correlated electronic structure of high-temperature superconductor Ba${}_2$CuO${}_{3+\delta }$
• High temperature spin-triplet topological superconductivity in K2Cr3As3
• Interplay of Zeeman field, Rashba spin-orbit interaction, and superconductivity: spin susceptibility
• Multiple phases in K2Cr3As3: a playground for manipulating topological superconductivity
• Hydrogen Doping Induced $p_x\pm i{p}_y$ Triplet Superconductivity in Quasi-One-Dimensional K${}_2$Cr${}_3$As${}_3$
• Superconductivity in the pressure-amorphized topological insulator CrP${}_4$