Signatures of Hund Metal and Fermi Liquid Behavior in Sr$_2$RuO$_4$ Revealed by Electronic Raman Scattering - Archive ouverte HAL
Pré-Publication, Document De Travail Année : 2023

Signatures of Hund Metal and Fermi Liquid Behavior in Sr$_2$RuO$_4$ Revealed by Electronic Raman Scattering

Résumé

We investigate the electronic Raman scattering of Sr$_2$RuO$_4$ using a material-realistic dynamical mean-field theory approach. We identify the low-energy Fermi liquid behavior and point out that the enhanced Raman response at higher energies displays clear signatures of Hund metals physics. These signatures originate in the two-stage coherence of Hund metals and associated quasiparticle 'unrenormalization'. In agreement with recent experimental observations we find a strong dichotomy between the $\mathrm{B}_{1g}$ and $\mathrm{B}_{2g}$ response, but our calculations suggest a novel interpretation of this dichotomy. The $\mathrm{B}_{1g}$ response is dominated by the $xy$ orbital and the $\mathrm{B}_{2g}$ response receives contributions from all orbitals and is strongly affected by interband nesting at finite frequencies.
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Dates et versions

hal-04238548 , version 1 (12-10-2023)

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Germán Blesio, Sophie Beck, Antoine Georges, Jernej Mravlje. Signatures of Hund Metal and Fermi Liquid Behavior in Sr$_2$RuO$_4$ Revealed by Electronic Raman Scattering. 2023. ⟨hal-04238548⟩
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