Peculiar properties of Cr${}_3$As${}_3$-chain-based superconductors

Abstract

$A_2$Cr${}_3$As${}_3$ ($A$ = K, Rb, Cs) are the unique Cr-based ambient-pressure superconductors to date discovered by serendipity in 2015. The new superconducting family are structurally characterized by quasi one-dimensional [(Cr${}_3$As${}_3$)${}^{2-}$]${}_{\infty }$ double-walled subnanotubes, which exhibit peculiar properties that mostly point to unconventional superconductivity. In this conference paper, we first describe how the superconductors were discovered. Then we overview the recent progresses on crystal structure, electronic structures, theoretical models, and various physical properties in $A_2$Cr${}_3$As${}_3$. Some new experimental results are included. Finally we conclude by addressing the related open questions in this emerging subfield of superconductivity.

arXiv comment19 pages, 9 figures and 1 table, submitted to Philosophical Magzine

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• Ion-exchange synthesis and superconductivity at 8.6 K of Na2Cr3As3 with quasi-one-dimensional crystal structure
• Exploring Topological Superconductivity in Topological Materials
• Multiband one-dimensional electronic structure and spectroscopic signature of Tomonoga-Luttinger liquid behavior in K${}_2$Cr${}_3$As${}_3$
• Tuning the distance to a possible ferromagnetic quantum critical point in A2Cr3As3
• Antiferromagnetic structure and electronic properties of BaCr2As2 and BaCrFeAs2
• Frustrated structural instability in superconducting quasi-one-dimensional K${}_2$Cr${}_3$As${}_3$
• Lifshitz Transition and Nontrivial H-Doping Effect in Cr-based Superconductor KCr${}_3$As${}_3$H${}_x$
• Intra-chain collinear magnetism and inter-chain magnetic phases in Cr3As3-K-based materials
• Gapless spin-excitations in the superconducting state of a quasi-one-dimensional spin-triplet superconductor
• Lifshitz transition enhanced triplet $p_z$-wave superconductivity in hydrogen doped KCr${}_3$As${}_3$
• The upper critical field and its anisotropy in RbCr${}_3$As${}_3$
• 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${}_4$
• 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