Synthesis, crystal structure and physical properties of quasi-one-dimensional ACr${}_3$As${}_3$ (A = Rb, Cs)

Abstract

Recently, new Cr-based superconductors, A${}_2$Cr${}_3$As${}_3$ (A = K, Rb, Cs), have gained a strong interest because of their one-dimensional crystal structures and electron correlations. Here we report the crystal structure and physical properties of two related materials ACr${}_3$As${}_3$ (A = Rb, Cs) which are synthesized via a soft-chemical A+ deintercalation in A${}_2$Cr${}_3$As${}_3$. The new compounds remain one-dimensional (Cr${}_3$As${}_3$)${}_{\infty }$ linear chains, and the interchain distance can be tuned by the incorporation of the alkali-metal cations with different sizes. The physical-property measurements indicate a local-moment behavior at high temperatures, and the moments freeze into a cluster spin-glass state below 5$\sim$6 K. No superconductivity was observed in both materials. We also found that, with increasing the interchain distance, the Cr effective moments increase monotonically, accompanied with the enhancement of semi-conductivity. Our results shed light on the understanding of occurrence of superconductivity in A${}_2$Cr${}_3$As${}_3$.

9 pages, 7 figures

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• Correlation between non-centrosymmetry and superconductivity in quasi-one-dimensional compounds A2Cr3As3 (A=K, Rb)
• Topological $p_z$-wave nodal-line superconductivity with flat surface bands in the AH${}_x$Cr${}_3$As${}_3$ (A=Na, K, Rb, Cs) superconductors