Spin-valve like magnetoresistance and moderate anomalous Hall effect in CoRuMnSn
Year: 2026
Type: article
Abstract: We report CoRuMnSn as a candidate material for spin-valve (SV) like features and moderate anomalous Hall effect, based on combined experimental and theoretical studies. It crystallizes in the F 4 ― 3 m space group with a 12.5% disorder between the Ru and Mn atoms, exhibiting a magnetic moment of 3.53 μ B /f.u. and a high Curie temperature (∼400 K). The magnetoresistance varies asymmetrically with field, indicating SV like behavior. The anomalous Hall conductivity (AHC) remains nearly constant (∼ –390 S cm −1 at 2 K) across a wide temperature ( T ) range and the weak T -dependence of Hall resistivity suggests an intrinsic AHC mechanism. Ab-initio calculations of electronic, magnetic, and transport properties agree well with experimental results. The band structure of ordered CoRuMnSn hosts four pairs of weyl points, contributing intrinsic Berry curvature to AHC (∼ –371 S cm −1 ). Simulations of experimentally observed Ru–Mn antisite disorder reveal pinning of those Mn atoms occupying the Ru sites, aligned antiferromagnetically with other magnetic atoms, thus reducing the net magnetization (3.69 μ B /f.u.), consistent with experiment. This pinning creates domains with antiferromagnetic/ferromagnetic interfaces, explaining the large asymmetric MR.
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,325
OpenAlex ID: W7154536992