Magnetic ground state of UCu2X2 (X=Si, Ge) from first principles

The electronic and magnetic structures of UCu2X2 germanide and silicide are revisited in view of existing controversy from experimental findings. From self-consistent calculations carried out within the local spin density functional theory using the augmented spherical wave method, the ground state is found to be ferromagnetic within simple and super cell setups. An analysis of the density of states and the chemical bonding shows the dominant role of Cu2Ge2-nearly planar like entities within the crystal lattice.