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Quasi-one-dimensional $A_2\text{Cr}_3\text{As}_3$ (with $A = \text{K, Cs,Rb}$) is an intriguing new family of superconductors which exhibit many similarfeatures to the cuprate and iron-based unconventional superconductor families.Yet in contrast to these systems, no charge or magnetic ordering has beenobserved which could provide the electronic correlations presumed necessary foran unconventional superconducting pairing mechanism - an absence which defiespredictions of first principles models. We report the results of neutronscattering experiments on polycrystalline $\text{K}_2\text{Cr}_3\text{As}_3$$(T_c \sim 7\text{K})$ which probed the low temperature dynamics near $T_c$ .Neutron diffraction data evidence a strong response of the nuclear lattice tothe onset of superconductivity while inelastic scattering reveals a highlydispersive column of intensity at the commensurate wavevector $q =(00\frac{1}{2})$ which loses intensity beneath $T_c$ - indicative ofshort-range magnetic fluctuations. Using linear spin-wave theory we model theobserved scattering and suggest a possible structure to the short-rangemagnetic order. These observations suggest that$\text{K}_2\text{Cr}_3\text{As}_3$ is in close proximity to a magneticinstability and that the incipient magnetic order both couples strongly to thelattice and competes with superconductivity - in direct analogy with theiron-based superconductors.

Coupling of structure to magnetic and superconducting orders in quasi-one-dimensional $\text{K}_2\text{Cr}_3\text{As}_3$