Dilemma in strongly correlated materials: Hund's metal vs relativistic Mott insulator
arXiv:2012.06752
Abstract
We point out the generic competition between the Hund's coupling and the spin-orbit coupling in correlated materials, and this competition leads to an electronic dilemma between the Hund's metal and the relativistic insulators. Hund's metals refer to the fate of the would-be insulators where the Hund's coupling suppresses the correlation and drives the systems into correlated metals. Relativistic Mott insulators refer to the fate of the would-be metals where the relativistic spin-orbit coupling enhances the correlation and drives the systems into Mott insulators. These contradictory trends are naturally present in many correlated materials. We study the competition between Hund's coupling and spin-orbit coupling in correlated materials and explore the interplay and the balance from these two contradictory trends. The system can become a spin-orbit-coupled Hund's metal or a Hund's assisted relativistic Mott insulator. Our observation could find a broad application and relevance to many correlated materials with multiple orbitals.
arXiv comment5 pages, 2 figures
References in corpus (24)
- Topological Insulators
- Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
- Colloquium: Topological Band Theory
- Strong electronic correlations from Hund's coupling
- Kitaev quantum spin liquid - concept and materialization
- U(1) Gauge Theory of the Hubbard Model : Spin Liquid States and Possible Application to k-(BEDT-TTF)_2 Cu_2 (CN)_3
- Orbital-selective Mott transitions in the degenerate Hubbard model
- Topological superconductivity on the surface of Fe-based superconductors
- Orbital-Selective Mott transition out of band degeneracy lifting
- Slave-rotor mean field theories of strongly correlated systems and the Mott transition in finite dimensions
- Theory of a continuous Mott transition in two dimensions
- Quantum spin ices and topological phases from dipolar-octupolar doublets on the pyrochlore lattice
- Orbital-selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides K(1-x)Fe(2-y)Se2
- Spin-orbit coupling in ordered double perovskites
- Parity-breaking phases of spin-orbit-coupled metals with gyrotropic, ferroelectric and multipolar orders
- Octupolar vs Néel Order in Cubic 5 double perovskites
- Electronic Structure of Strongly Correlated Systems Emerging from Combining Path-Integral Renormalization Group with Density Functional Approach
- Magnetically Hidden Order of Kramers Doublets in Systems: SrVO
- Multipolar magnetism in d-orbital systems: Crystal field levels, octupolar order, and orbital loop currents
- Pairing Mechanism in Hunds Metal Superconductors and the Universality of the Superconducting Gap to Critical Temperature Ratio
- Orbital-Degenerate Paramagnetic Metal Sr2MoO4: An Electronic Analogue to Sr2RuO4
- Magnetism and Mott Transition: A Slave-rotor Study
- BaOsO: A Hund's metal in the presence of strong spin-orbit coupling
- The Hund's Superconductor Li(Fe,Co)As