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We show that in multi-band metals the correlations are strongly affected bythe Hund's rule coupling, which depending on the filling promotes metallic,insulating or bad-metallic behavior. The quasiparticle coherence and theproximity to a Mott insulator are influenced distinctly and, away from single-and half-filling, in opposite ways. A strongly correlated bad-metal far from aMott phase is found there. We propose a concise classification of 3d and 4dtransition-metal oxides within which the ubiquitous occurrence of strongcorrelations in Ru- and Cr-based oxides, as well as the recently measured highN\'eel temperatures in Tc-based perovskites are naturally explained.

Janus-faced influence of the Hund's rule coupling in strongly correlated materials