Electronic structure and x-ray magnetic circular dichroism in uranium compounds. III. Heavy-fermion compounds

The electronic structure and x-ray magnetic circular dichroism (XMCD) spectra of heavy-fermion compounds ${\mathrm{UPt}}_3,$ ${\mathrm{URu}}_2{\mathrm{Si}}_2,$ ${\mathrm{UPd}}_2{\mathrm{Al}}_3,$ ${\mathrm{UNi}}_2{\mathrm{Al}}_3,$ and ${\mathrm{UBe}}_{13}$ are investigated theoretically from first principles, using the fully relativistic Dirac linear muffin-tin orbital band-structure method. The electronic structure is obtained with the local spin-density approximation (LSDA), as well as with a generalization of the $\mathrm{LSDA}+U$ method. The origin of the XMCD spectra in the compound is examined.