Janus-Faced Influence of Hund’s Rule Coupling in Strongly Correlated Materials
Janus-Faced Influence of Hund’s Rule Coupling in Strongly Correlated Materials
We show that in multiband metals the correlations are strongly affected by Hund's rule coupling, which depending on the filling promotes metallic, insulating or bad-metallic behavior. The quasiparticle coherence and the proximity to a Mott insulator are influenced distinctly and, away from single- and half-filling, in opposite ways. A strongly …