Half-metallic, magneto-optic, and thermoelectric properties of CoRuVZ (Z=Al, Ga)

•The CoRuVAl and CoRuVGa Heusler compounds were confirmed to be dynamically stable.•The CoRuVAl and CoRuVGa Heusler compounds have half-metallic nature.•The CoRuVAl and CoRuVGa Heusler compounds have magneto-optical responses in the visible range.•The CoRuVAl and CoRuVGa Heusler compounds have prospective thermoelectric efficiency at room temperature. Based on the density functional theory, structural, phonon stability, half-metallic, optical, magneto-optical, and thermoelectric properties of CoRuVAl and CoRuVGa compounds have been calculated. In the ferromagnetic phase, these compounds have equilibrium volumes. Elastic coefficients and their related parameters indicate the elastic stability of these compounds. Moreover, the B/G ratio indicates their ductile behavior. Phonon scattering in the first Brillouin zone in both compounds indicates dynamic stability. The electrical properties of these compounds with GGA+U+mBJ approximation demonstrate half-metallic behavior with a spin-flip gap of 1.5 eV and 1.2 eV for CoRuVAl and CoRuVGa, respectively. Kerr and Epsilon angles of these compounds have significant peaks in the visible region, representing large polarization leading to proper magneto-optical behavior in the visible region. Thermoelectric parameters such as the figure of merit and Seebeck coefficients indicate that these compounds are suitable for thermoelectric applications at room temperature.