The effect of temperature on electronic, elastic and thermodynamic properties of [formula omitted] ([formula omitted] and [formula omitted]).

We investigated the effect of temperature on the electronic, elastic, and thermodynamic properties of Co -based full-Heusler Co 2 MnSi and Co 2 MnGe. The results show that the alloys are half-metallic ferromagnetic. The spin polarization is 97.90% for Co 2 MnSi , while for Co 2 MnGe is more than 85.3% below 1000 K. The study of elastic constants and their associated parameters predicted that the two alloys are mechanically stable in the temperature range of 0 – 1000 K. Both alloys are ductile, anisotropic, and characterized by ionic bonds. In addition, Co 2 MnGe is less hard than Co 2 MnSi , but the latter is more sensitive to temperature variations than Co 2 MnGe. The electronic and vibrational contributions to the thermodynamic properties were computed separately in the temperature range of 0 K to 1000 K. The high spin polarization and mechanical stability make these alloys more appropriate for spintronic applications. [ABSTRACT FROM AUTHOR]