The proximity of a Mott insulating state (``Mottness'') is responsible for strong correlations in a number of materials, especially oxides of 3d transition metals. In this talk, I will emphasize that the Hund's rule coupling induces strong correlation effects in materials which are not close to a Mott insulator. This is especially relevant for oxides of 4d transition metals such as ruthenates, andalso for iron-based superconductors. The Hund's rule coupling will be shown to have antagonistic effects on the Mott gap and on the quasiparticle coherence scale.It is actually remarkable that intra-atomic physics turns out to be physically relevant even in rather itinerant metals: for this reason, the self-consistent embedded-atom construction at the heart of Dynamical Mean-Field Theory proves to be especially meaningful for
those materials.

References:
L.de' Medici, J.Mravlje and A.Georges Phys. Rev. Lett. 107, 256401 (2011);
A.Georges, L. de'Medici and J. Mravlje. Annual Reviews of Condensed Matter
Physics, Vol.4 (2013) arXiv:1207.3033