Fermi surface nesting driven anomalous Hall effect in magnetically frustrated Mn_2PdIn

TL;DR

This paper reports the discovery of a topologically nontrivial electronic structure in Mn_2PdIn, a noncollinear magnet with quenched magnetization, exhibiting a significant anomalous Hall effect driven by Fermi surface nesting and Weyl-type band crossings.

Contribution

It demonstrates the presence of Weyl-type band crossings and a large anomalous Hall effect in Mn_2PdIn, revealing a new platform for spintronics with noncollinear, low-magnetization materials.

Findings

Weyl-type band crossings near the Fermi level in Mn_2PdIn

Pronounced anomalous Hall effect observed in transport measurements

Quadratic relationship between longitudinal and Hall resistivities indicating Berry curvature contribution

Abstract

Noncollinear magnets with near-zero net magnetization and nontrivial bulk electronic topology hold significant promise for spintronic applications, though their scarcity necessitates purposeful design strategies. In this work, we report a topologically nontrivial electronic structure in metallic Mn_2PdIn, which crystallizes in the inverse Heusler structure and exhibits a spin-glassy ground state with quenched magnetization. The system features Weyl-type band crossings near the Fermi level and reveals a novel interplay among momentum-space nesting, orbital hybridization, and spin-orbit coupling. Comprehensive transport measurements uncover a pronounced anomalous Hall effect (AHE) in Mn_2PdIn. The observed quadratic relationship between the longitudinal and anomalous Hall resistivities highlights the intrinsic Berry curvature contribution to AHE. These findings establish inverse Heusler alloys as compelling platforms for realizing noncollinear magnets that host Weyl-type semimetallic or metallic phases-combining suppressed magnetization with robust electronic transport-thereby offering a promising route toward their seamless integration into next-generation spintronic devices.