First-principles Predictions on Half-Metallic, Mechanical, and Acoustic Properties of CuHg 2 Ti-Type Mn 2 LiZ (Z=As, Sb) Compounds

Using first-principles calculations, we predicted the half-metallic, mechanical, and acoustic properties of novel CuHg2Ti-type Mn2LiZ (Z=As, Sb) compounds. It was found that Mn2LiAs and Mn2LiSb are half-metallic ferrimagnetic compounds with gaps in the minority-spin direction of 1.094 and 1.099 eV in equilibrium state, respectively, and have an integer total magnetic moments of 2.000 μB per formula unit for adherence to the Slater-Pauling rule. It was also found that Mn2LiAs and Mn2LiSb are mechanically stable, brittle, and elastically anisotropic, and Mn2LiAs has more brittleness, more significant anisotropy, and higher Debye temperature than Mn2LiSb.