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| Hauptseite > Institutssammlungen > JSC > Optical conductivity, Fermi surface, and spin-orbit coupling effects in Sr 2 RhO 4 |
| Hauptseite > Institutssammlungen > JSC > Optical conductivity, Fermi surface, and spin-orbit coupling effects in Sr 2 RhO 4 |
| Journal Article | FZJ-2020-03817 |
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2019
Inst.
Woodbury, NY
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Please use a persistent id in citations: doi:10.1103/PhysRevB.99.125102
Abstract: By using the local-density approximation + dynamical mean-field theory approach, we study the low-energy electronic properties of $Sr_2RhO_4$ in a realistic setting, and compare to $Sr_2RuO_4$. We investigate the interplay of spin-orbit coupling, crystal field, and Coulomb interaction, including the tetragonal terms of the Coulomb tensor. We find that (i) differently than in $Sr_2RuO_4$, the zero-frequency effective crystal-field “enhancement” due to Coulomb repulsion, ΔɛCF(ω=0), is small and, depending on the parameters, even negative. (ii) In addition, the effects of (realistic) anisotropic Coulomb terms are weak. (iii) Instead, the effective zero-frequency enhancement of the spin-orbit interaction doubles the value of the corresponding local-density approximation couplings. This explains the experimental Fermi surface and supports a previous proposal based on static mean-field calculations. We find that the sign of the Coulomb-induced spin-orbit anisotropy is influenced by the octahedral rotation. Based on these conclusions, we examine recent optical conductivity experiments. (iv) We show that the spin-orbit interaction is key for understanding them; differently than in $Sr_2RuO_4$, the $t_{2g}$ intraorbital contributions are small; thus, the single-band picture does not apply.
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