Distinct spin and orbital dynamics in Sr${}_2$RuO${}_4$

Abstract

The unconventional superconductor Sr${}_2$RuO${}_4$ has long served as a benchmark for theories of correlated-electron materials. The determination of the superconducting pairing mechanism requires detailed experimental information on collective bosonic excitations as potential mediators of Cooper pairing. We have used Ru $L_3$-edge resonant inelastic x-ray scattering to obtain comprehensive maps of the electronic excitations of Sr${}_2$RuO${}_4$ over the entire Brillouin zone. We observe multiple branches of dispersive spin and orbital excitations associated with distinctly different energy scales. The spin and orbital dynamical response functions calculated within the dynamical mean-field theory are in excellent agreement with the experimental data. Our results highlight the Hund metal nature of Sr${}_2$RuO${}_4$ and provide key information for the understanding of its unconventional superconductivity.

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Cited by in corpus (10)

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• Exploring Quantum Materials with Resonant Inelastic X-Ray Scattering
• Signatures of Hund Metal and finite-frequency nesting in Sr${}_2$RuO${}_4$ Revealed by Electronic Raman Scattering
• Magnetic ground state of the dimer-based hexagonal perovskite Ba${}_3$ZnRu${}_2$O${}_9$
• Polar Kerr Effect in Multiband Spin-Orbit Coupled Superconductors
• Dual-space cluster-diagrammatic approach to nonlocal electronic correlations
• Observation of spin-conserving two-spinon continuum in the $S$=1/2 antiferromagnetic chain system Sr${}_2$CuO${}_3$ using Cu $K$-edge resonant inelastic x-ray scattering
• Frequency-Dependent Superconducting States From the Two-Time Linear Response Theory: Application To Sr${}_2$RuO${}_4$
• Strong effects of thermally induced low-spin-to-high-spin crossover on transport properties of correlated metals
• Anisotropic scattering rates in strain-tuned Sr${}_2$RuO${}_4$