Majority-spin non-quasiparticle states in half-metallic ferrimagnet Mn$_2$VAl

TL;DR

This paper investigates the non-quasiparticle states in the half-metallic ferrimagnet Mn$_2$VAl, revealing unique majority-spin states below the Fermi level that can be experimentally observed and provide insights into many-body effects in spintronics.

Contribution

It presents first-principles calculations of non-quasiparticle states in Mn$_2$VAl, highlighting the presence of majority-spin states below the Fermi level, unlike typical half-metals.

Findings

Non-quasiparticle states are below the Fermi level in Mn$_2$VAl.

These states are detectable via spin-polarized photoemission.

The study offers a new approach to explore many-body effects in spintronic materials.

Abstract

The density of non-quasiparticle states in the ferrimagnetic full-Heuslers Mn$_2$VAl alloy is calculated from first principles upon appropriate inclusion of correlations. In contrast to most half-metallic compounds, this material displays an energy gap in the majority-spin spectrum. For this situation, non-quasiparticle states are located below the Fermi level, and should be detectable by spin-polarized photoemission. This opens a new way to study many-body effects in spintronic-related materials.