The electronic structure of U${\mathit{T}}_2$${\mathrm{Si}}_2$, where T=Cr, Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Os, is determined by means of self-consistent density-functional calculations in the local approximation treating the U 5f states as band states. A pronounced trend in the hybridization strength is exposed and is deduced to give rise to the different magnetic properties of the compounds. In agreement with experiment, the nonmonotonic behavior in the subseries containing 3d elements is reproduced, especially the state of ${\mathrm{UFe}}_2$${\mathrm{Si}}_2$ which is nonmagnetic in contrast to the other 3d members. The underlying physics of this fact is explained. Furthermore, special features of the heavy-fermion system ${\mathrm{URu}}_2$${\mathrm{Si}}_2$ are discussed.

• Received 7 April 1994

DOI:https://doi.org/10.1103/PhysRevB.50.9258