Correlation stabilized ferromagnetic MnRuAs with distorted kagome lattice

TL;DR

This study uses advanced calculations to analyze MnRuAs with a distorted kagome lattice, revealing its stable ferromagnetic state, unique electronic features, and complex surface states, advancing understanding of correlated magnetic materials.

Contribution

It demonstrates how strong correlation effects stabilize ferromagnetism in MnRuAs with a distorted kagome lattice, providing detailed insights into its magnetic and electronic properties.

Findings

MnRuAs exhibits a stable ferromagnetic state due to correlation effects.

The material has a quasi-one-dimensional Fermi surface and nodal sphere formation.

Magnon dispersion shows a parabolic profile with a minimum at the Γ point.

Abstract

We present an in-depth analysis of MnRuAs, a compound crystallizing in the P$\bar{6}$2m symmetry with a distorted kagome lattice, revealing its distinctive structural, magnetic, and electronic properties through state-of-the-art ab initio calculations. By incorporating strong correlation effects using the DFT+U approach, we demonstrate the stabilization of MnRuAs, transforming its inherent dynamical instability into a robust ferromagnetic state with significant coupling along the $c$ axis. The calculated magnon dispersion reveals a parabolic profile with a minimum at the $\Gamma$ point, indicative of ferromagnetic behavior. Furthermore, MnRuAs exhibits intriguing electronic properties, including quasi-one-dimensional Fermi surface and the formation of nodal sphere. Our study also delves into the electronic surface states and constant energy contours, offering valuable insights into the complex physics of this material.