Effect of As and Nb doping on the magnetic properties for quaternary Heusler alloy FeCoZrGe

•The half-metallic properties of As- and Nb-systems of FeCoZrGe are studied.•We simulate the doped systems by supercell and virtual crystal approximations.•The magnetic, electronical and stabile properties are discussed.•The half-metallic gap variation with the doped proportion is shown.

We investigate the effect of doping on FeCoZrGe. Electronic structure calculations reveal that doping of As or Nb into FeCoZrGe will transform it into half-metallic materials. They have half-metallic properties in a large range of proportion of As or Nb's doping. So by doping with different proportion of As or Nb, the controllable half-metallic gaps can be realized. In addition, this doped system can have higher Curie temperature.