Strong Correlations from Hund’s Coupling

By A. Georges, L. Medici, J. Mravlje. 2012

730 citations recorded by the source corpus.

Strong electronic correlations are often associated with the proximity of a Mott-insulating state. In recent years however, it has become increasingly clear that the Hund’s rule coupling (intra-atomic exchange) is responsible for strong correlations in multiorbital metallic materials that are not close to a Mott insulator. Hund’s coupling has two effects: It influences the energetics of the Mott gap and strongly suppresses the coherence scale for the formation of a Fermi liquid. A global picture has emerged recently, which emphasizes the importance of the average occupancy of the shell as a control parameter. The most dramatic effects occur away from half-filling or single occupancy. We review the theoretical understanding and physical properties of these Hund’s metals, together with the relevance of this concept to transition-metal oxides (TMOs) of the 3d, and especially 4d, series (such as ruthenates), as well as to the iron-based superconductors (iron pnictides and chalcogenides).

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/a3c37fbf39c9ac17ef9227fc3cdc34cdb78add0b

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Condensed Matter Physics

1. A. D. L. Torre
2. A. Georges
3. S. Sachdev

In Electronic, Optical and Magnetic Materials

1. A. D. L. Torre
2. A. Georges

Citations in the corpus

• High-Resolution Photoemission on Sr2RuO4 Reveals Correlation-Enhanced Effective Spin-Orbit Coupling and Dominantly Local Self-Energies (2018, background): “[18] Antoine Georges, Luca de’ Medici, and Jernej Mravlje, “Strong Correlations from Hund’s Coupling,” Annu.”
• Angle-resolved photoemission studies of quantum materials (2020, neutral): “Due to inter-orbital Hund’s coupling, the effect of electronic correlation U on the dxy orbital is relatively independent of that on other d orbitals (Georges et al., 2013; Haule and Kotliar, 2009).”