Structural Instability and Magnetism of Superconducting KCr${}_3$As${}_3$

Abstract

We find a lattice instability in the superconductor KCr${}_3$As${}_3$, corresponding to a distortion of the Cr metallic wires in the crystal structure. This distortion couples strongly to both the electronic and magnetic properties, in particular by making the electronic structure much more nearly one-dimensional, and by shifting the compound away from magnetism. We discuss the implications of these results in the context of the possibly unconventional superconductivity of this phase.

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• Cluster spin-glass ground state in quasi-one-dimensional KCr${}_3$As${}_3$
• Superconductivity at 7.3 K in the 133-type Cr-based RbCr3As3 single crystals
• Coupling of structure to magnetic and superconducting orders in quasi-one-dimensional ${\text{K}}_2{\text{Cr}}_3{\text{As}}_3$

Cited by in corpus (4)

• K2Mo3As3 is a Multi-Gap Electron-Phonon Superconductor
• Gapless spin-excitations in the superconducting state of a quasi-one-dimensional spin-triplet superconductor
• The upper critical field and its anisotropy in RbCr${}_3$As${}_3$
• 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