Janus-faced influence of Hund's rule coupling in strongly correlated materials |
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Authors: | de' Medici Luca Mravlje Jernej Georges Antoine |
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Institution: | Laboratoire de Physique des Solides, UMR8502 CNRS-Université Paris-Sud, Orsay, France. |
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Abstract: | 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 correlated bad metal far from a Mott phase is found there. We propose a concise classification of 3d and 4d transition-metal oxides within which the ubiquitous occurrence of strong correlations in Ru- and Cr-based oxides, as well as the recently measured high Néel temperatures in Tc-based perovskites are naturally explained. |
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