Ab initio random-phase-approximation calculation of the frequency-dependent effective interaction between 3d electrons:: Ni, Fe, and MnO

We calculate the frequency-dependent effective interaction between 3d electrons for Fe, Ni, and MnO (antiferromagnetic type II) in the random-phase approximation (RPA), where the contributions of 3d electrons to the dielectric function are projected out. It is concluded that the real part of the interaction for Fe and Ni shows only a weak frequency dependence.