Fermi-liquid behavior of non-altermagnetic RuO${}_2$

Abstract

Presence of magnetism in potentially altermagnetic RuO${}_2$ has been a subject of intense debate. Using broadband infrared spectroscopy combined with density-functional band-structure calculations, we show that optical conductivity of RuO${}_2$, the bulk probe of its electronic structure, is well described by the nonmagnetic model of this material. The sharp Pauli edge demonstrates the presence of a Dirac nodal line lying 45 meV below the Fermi level. Good match between the experimental and ab initio plasma frequencies underpins weakness of electronic correlations. The intraband part of the optical conductivity indicates Fermi-liquid behavior with two distinct scattering rates below 150 K. Fermi-liquid theory also accounts for the temperature-dependent magnetic susceptibility of RuO${}_2$ and allows a consistent description of this material as paramagnetic metal.

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Cited by in corpus (20)

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• Strain controlled g- to d-wave transition in altermagnetic CrSb
• Controlling photo-excited electron-spin by light-polarization in ultrafast-pumped altermagnets
• Symmetry-breaking induced surface magnetization in non-magnetic RuO${}_2$
• The Fermi surface of RuO2 measured by quantum oscillations
• Non-linear anomalous Edelstein response at altermagnetic interfaces
• Constraints on magnetism and correlations in RuO${}_2$ from lattice dynamics and Mössbauer spectroscopy
• Exploration of Altermagnetism in $\mathrm{Ru}{\mathrm{O}}_2$
• Surface-Localized Magnetic Order in RuO2 Thin Films Revealed by Low-Energy Muon Probes
• Growth of ultra-clean single crystals of RuO2
• Observation of mirror-odd and mirror-even spin texture in ultrathin epitaxially strained RuO2 films
• Altermagnetism, ARPES, symmetry, non-relativistic band splitting
• $d$-Wave Polarization-Spin Locking in Two-Dimensional Altermagnets
• Ferromagnetic interface engineering of spin-charge conversion in RuO${}_2$
• Pressure-Induced Metal-Insulator and Paramagnet-Altermagnet Transitions in Rutile OsO2 Single Crystals
• Absence of magnetic order in epitaxial RuO2 revealed by X-ray linear dichroism
• Optical phonons as a testing ground for spin group symmetries
• Fermi-liquid behavior and characteristic temperature-dependent susceptibility in clean RuO${}_2$ crystal
• Altermagnetism from the viewpoint of chemistry