The electronic and magnetic properties of Heusler alloys Co2MnGa1-xGex (x?=?0.00, 0.25, 0.50, 0.75, and 1.00) have been investigated using first-principles density functional theory within the generalized gradient approximation (GGA) scheme. The calculations reveal that with increasing x the lattice constants slightly decrease. When x?=?0.5, alloys are half-metallic (HM) ferromagnets and the total magnetic moments obey Slater-Pauling rule quite well. Mn atoms show high spin states due to the special sites in compounds. The ferromagnetic couplings are observed in Co2MnGa1-xGex alloys. The sensitivity of half-metallicity and the change of HM gap for specific lattice constants are also discussed in detail. Calculated results show the half-metallicity of Co2MnGa0.25Ge0.75 can be maintained in a wider lattice constant range.
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