Spin-orbit coupling in three-orbital Kanamori impurity model and its relevance for transition-metal oxides
| Autor: | Horvat, Alen, Zitko, Rok, Mravlje, Jernej |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 96, 085122 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.96.085122 |
| Popis: | We investigate the effects of the spin-orbit coupling (SOC) in a three-orbital impurity model with Kanamori interaction using the numerical renormalization group method. We focus on the impurity occupancy $N_d=2$ relevant to the dynamical mean-field theory studies of Hund's metals. Depending on the strength of SOC $\lambda$ we identify three regimes: usual Hund's impurity for $|\lambda|<\lambda_c$, van-Vleck non-magnetic impurity for $\lambda > \lambda_c$, and a $J=2$ impurity for $\lambda < -\lambda_c$. 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, $\lambda_c =T_K^\mathrm{orb}$ that drops with increasing interaction strength. This implies that oxides with strong electronic correlations are more prone to the effects of the spin-orbit coupling. Comment: 5 pages, 3 figures |
| Databáze: | arXiv |
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