Recently a new family of Cr-based A 2 Cr 3 As 3 (A = K, Rb, Cs) superconductors were reported, which own a rare quasi-one-dimensional (Q1D) crystal structure with infinite (Cr 3 As 3 ) 2chains and exhibit intriguing superconducting characteristics possibly derived from spin-triplet electron pairing. The crystal structure of A 2 Cr 3 As 3 is actually a slight variation of the hexagonal TlFe 3 Te 3 prototype although they have different lattice symmetry. Here we report superconductivity in a 133-type KCr 3 As 3 compound that belongs to the latter structure. The single crystals of KCr 3 As 3 were prepared by the deintercalation of K ions from K 2 Cr 3 As 3 crystals which were grown from a high-temperature solution growth method, and it owns a centrosymmetric lattice in contrast to the non-centrosymmetric K 2 Cr 3 As 3 .After annealing at a moderate temperature, the KCr 3 As 3 crystals show bulk superconductivity at 5 K revealed by electrical resistivity, magnetic susceptibility and heat capacity measurements. The discovery of this KCr 3 As 3 superconductor provides a different structural instance to study the exotic superconductivity in these Q1D Cr-based superconductors.

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Abstract:Here we report the preparation and superconductivity of the 133-type Cr-based quasi-one-dimensional (Q1D) RbCr 3 As 3 single crystals.

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