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Recently a new family of Cr-based A2Cr3As3 (A = K, Rb, Cs) superconductorswere reported, which own a rare quasi-one-dimensional (Q1D) crystal structurewith infinite (Cr3As3)2- chains and exhibit intriguing superconductingcharacteristics possibly derived from spin-triplet electron pairing. Thecrystal structure of A2Cr3As3 is actually a slight variation of the hexagonalTlFe3Te3 prototype although they have different lattice symmetry. Here wereport superconductivity in a 133-type KCr3As3 compound that belongs to thelatter structure. The single crystals of KCr3As3 were prepared by thedeintercalation of K ions from K2Cr3As3 crystals which were grown from ahigh-temperature solution growth method, and it owns a centrosymmetric latticein contrast to the non-centrosymmetric K2Cr3As3. After annealing at a moderatetemperature, the KCr3As3 crystals show bulk superconductivity at 5 K revealedby electrical resistivity, magnetic susceptibility and heat capacitymeasurements. The discovery of this KCr3As3 superconductor provides a differentstructural instance to study the exotic superconductivity in these Q1D Cr-basedsuperconductors.

Superconductivity at 5 K in quasi-one-dimensional Cr-based KCr3As3 single crystals