A comparative study of physical and thermoelectrical characteristics of the new <scp>full‐Heusler</scp> alloys <scp>Ag<sub>2</sub>TiGa</scp> and <scp>Ag<sub>2</sub>VGa</scp> with ab initio calculations
I. Ait Elkoua, R. Masrour
Abstract
Abstract This paper will focus on the comparative study of the structural, electronic, magnetic, optical, and thermoelectric properties of the two Heusler systems Ag 2 TiGa and Ag 2 VGa in the inverse L2 1 Hg 2 CuTi structure. Using the density functional theory‐based wien2k code, which implements the computational methods used in this study, namely GGA, GGA‐mBJ, GGA + U, and GGA + SOC (spin‐orbit coupling). The band structures show that all two structures studied are metallic. The spin density of states of Ag 2 VGa has evident spin splitting near the Fermi level , and the total magnetic moment of the Ag 2 VGa structure is 2.19 μ B , which indicates that Ag 2 VGa is magnetic. The full‐Heusler Ag 2 VGa material can be used as spintronic materials due to their high spin polarization (about 50%). While Ag 2 TiGa has low polarization so it is bad electronically, but better thermoelectrically than Ag 2 VGa. So, the full‐Heusler Ag 2 TiGa material may also be considered as a potential candidate for thermoelectric applications at room temperature. Studies of the two new Heusler alloys may provide a theoretical reference for subsequent theoretical research and experimental synthesis of Ag‐based Heusler alloys.