Hard Magnetic Topological Semimetals in XPt3: Harmony of Berry Curvature

TL;DR

This paper investigates XPt3 compounds as magnetic topological semimetals with unique gapped nodal lines that produce significant Berry curvature effects, demonstrating both theoretical calculations and experimental measurements of their anomalous Hall effect.

Contribution

It reveals the presence of two sets of gapped nodal lines in XPt3 compounds that dominate Berry curvature, supported by first-principles calculations and experimental film growth.

Findings

Maximum AHE of 1965 S/cm in CrPt3 from calculations

Experimental AHE of 1750 S/cm in thin films

High-quality films with robust magnetic properties

Abstract

Topological magnetic semimetals, like Co3Sn2S2 and Co2MnGa, are known to display exotic transport properties, such as large intrinsic anomalous (AHE) due to uncompensated Berry curvature. The highly symmetric XPt3 compounds display anti-crossing gapped nodal lines, which are a driving mechanism in the intrinsic Berry curvature Hall effects. Uniquely, these compounds contain two sets of gapped nodal lines that harmoniously dominate the Berry curvature in this complex multiband system. We calculate a maximum AHE of 1965 S/cm in the CrPt3 by a state-of-the-art first principle electronic structure. We have grown high-quality thin films by magnetron sputtering and measured a robust AHE of 1750 S/cm for different sputtering growth conditions. Additionally, the cubic films display a hard magnetic axis along [111] direction. The facile and scalable fabrication of these materials is prime candidates for integration into topological devices.