Abstract
We investigate the effects of spin-orbit coupling (SOC) in a three-orbital impurity model with a Kanamori interaction using the numerical renormalization group method. We focus on the impurity occupancy relevant to the dynamical mean-field theory studies of Hund's metals. Depending on the strength of SOC , we identify three regimes: the usual Hund's impurity for , the van Vleck nonmagnetic impurity for , and a impurity for . They all correspond to a Fermi liquid but with very different quasiparticle phase shifts and different physical properties. The crossover between these regimes is controlled by an emergent scale, the orbital Kondo temperature , that drops with increasing interaction strength. This implies that oxides with strong electronic correlations are more prone to the effects of spin-orbit coupling.
- Received 13 April 2017
- Revised 31 July 2017
DOI:https://doi.org/10.1103/PhysRevB.96.085122
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