# Structural Instability and Magnetism of Superconducting KCr$_3$As$_3$

## TL;DR

This study reveals a lattice instability in KCr₃As₃ that affects its electronic and magnetic properties, providing insights into its potential unconventional superconductivity.

## Contribution

It uncovers a lattice distortion in KCr₃As₃ that influences its electronic structure and magnetic behavior, highlighting the role of structural instability in superconductivity.

## Key findings

- Lattice instability causes distortion of Cr wires.
- Distortion enhances one-dimensional electronic features.
- Distortion suppresses magnetic tendencies.

## 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.