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

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