Band splitting induced Berry flux and intrinsic anomalous Hall conductivity in the NiCoMnGa quaternary Heusler compound
Gaurav Shukla, Jyotirmoy Sau, Vishal Kumar, Manoranjan Kumar, Sanjay Singh
Abstract
The anomalous transport properties of Heusler compounds have become a hot spot of research in recent years due to their unique band structure and possible application in spintronics. In this paper, we report the anomalous Hall effect in a polycrystalline NiCoMnGa quaternary Heusler compound by experimental means and theoretical calculations. The experimental anomalous Hall conductivity (AHC) was found to be about 256 S/cm at 10 K with an intrinsic contribution of $\ensuremath{\sim}121$ S/cm. The analysis of Hall data reveals the presence of both extrinsic and intrinsic contributions in the anomalous Hall effect. Our theoretical calculations show that a pair of spin-orbit coupled bands formed by the band splitting due to spin-orbit interaction at the Fermi level produces a finite Berry flux in the system that provides an intrinsic AHC of about 100 S/cm, which is in good agreement with the experiment.