Fig. 1: Crystal and electronic structure and Nernst measurement geometry. | NPG Asia Materials

Fig. 1: Crystal and electronic structure and Nernst measurement geometry.

From: Anomalous Nernst effect beyond the magnetization scaling relation in the ferromagnetic Heusler compound Co2MnGa

Fig. 1

a Crystal structure of Co2MnGa. The structure consists of four interpenetrating fcc sublattices. Two of the sublattices are formed by Co atoms, and the other two are formed by Mn and Ga atoms. b Electronic structure of Co2MnGa with and without spin-orbit coupling (SOC). The nodal line regions are marked with circles and magnified in the inset. SOC induces a gap in the nodal line in the blue colored circle by lifting the degeneracy of the bands. The dashed lines indicate different positions of the Fermi level (EF) with respect to the charge neutrality point E0. c Berry curvature distribution in Brillouin zone with [01\(\bar 1\)] magnetization direction. The dotted green lines indicate the nodal lines. The Berry curvature is concentrated around the gapped lines. d Schematic representation of the Nernst measurement. In this geometry, a transverse thermoelectric voltage Vy is produced by a temperature gradient ∇Tx and a magnetic field μ0H normal to each other

Back to article page