Evolution of the magnetic excitations in NaOsO${}_3$ through its metal-insulator transition

Abstract

The temperature dependence of the excitation spectrum in NaOsO${}_{\text{3}}$ through its metal-to-insulator transition (MIT) at 410 K has been investigated using resonant inelastic X-ray scattering (RIXS) at the Os L${}_{\text{3}}$ edge. High resolution ($\Delta E\sim$ 56 meV) measurements show that the well-defined, low energy magnons in the insulating state weaken and dampen upon approaching the metallic state. Concomitantly, a broad continuum of excitations develops which is well described by the magnetic fluctuations of a nearly antiferromagnetic Fermi liquid. By revealing the continuous evolution of the magnetic quasiparticle spectrum as it changes its character from itinerant to localized, our results provide unprecedented insight into the nature of the MIT in NaOsO${}_{\text{3}}$.

arXiv commentAccepted in Physical Review Letters, part of a joint submission to Physical Review B. Supersedes arXiv:1707.05551

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• Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO${}_{\text{3}}$
• Direct observation of electron density reconstruction at the metal-insulator transition in NaOsO3
• Magnetically induced metal-insulator transition in Pb2CaOsO6
• Spin and orbital dynamics through the metal-to-insulator transition in Cd${}_2$Os${}_2$O${}_7$ probed with high-resolution RIXS
• Coupled spin-orbital fluctuations in a three orbital model for $4d$ and $5d$ oxides with electron fillings $n=3,4,5$ -- Application to $\mathrm{NaOs}{\mathrm{O}}_3$, $\mathrm{C}{\mathrm{a}}_2\mathrm{Ru}{\mathrm{O}}_4$, and $\mathrm{S}{\mathrm{r}}_2\mathrm{Ir}{\mathrm{O}}_4$
• Melting of magnetic order in ${\mathrm{NaOsO}}_3$ by fs laser pulses
• Study of polycrystalline bulk Sr${}_3$OsO${}_6$ double-perovskite insulator: comparison with 1000 K ferromagnetic epitaxial films
• Altermagnetism and Weak Magnetism in the Insulating Distorted Perovskite Antiferromagnet NaOsO${}_3$