Electronic, magnetic and thermal properties of Co2CrxFe1 xX (X=Al, Si) Heusler alloys: First principles calculations
Abstract Density functional theory (DFT) based on the full potential linearized augmented plane wave (FP LAPW) method is used to investigate the structural, electronic, magnetic and thermal properties of Co2CrxFe1 xX (X=Al, Si) full Heusler alloys, with L21 structure. The structural properties and spin magnetic moments are investigated by the generalized gradient approximations (GGA) minimizing the total energy. For band structure calculations, GGA, the Engel Vosko generalized gradient approximation (EVGGA) and modified Becke Johnson (mBJ) schemes are used. Results of density of states (DOS) and band structures show that these alloys are half metallic ferromagnets (HMFS) A regular solution model has been used to investigate the thermodynamic stability of the compounds Co2CrxFe1 xX that indicates a phase miscibility gap. The thermal effects using the quasi harmonic Debye model are investigated within the lattice vibrations. The temperature and pressure effects on the heat capacities, Debye temperatures and entropy are determined from the non equilibrium Gibbs functions.