The electronic and magnetic properties of  are studied  by band structure calculation based on the density functional  theory within LDA,  and fully relativistic schemes. The Ce  f-bands are located near the Fermi energy  and hybridize weakly with the Rh-4d bands. The exchange interaction between local f electrons and conduction electrons play an important role in the heavy fermion characters of them. The electronic structure with the spin-orbit interaction and on-site Coulomb potential for the Ce-derived 4f orbitals was calculated for the correct ground state of  The fully relativistic band structure scheme shows that spin-orbit coupling splits the Ce 4f states into two manifolds. When the Coulomb potential is added to the Ce 4f orbitals, the degeneracy between the different f orbitals is lifted and they are split into lower Hubbard bands and upper Hubbard bands.

electronic structure,