Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO3

J. G. Vale; S. Calder; C. Donnerer; D. Pincini; Y. G. Shi; Y. Tsujimoto; K. Yamaura; M. Moretti Sala; J. Van Den Brink; A. D. Christianson; D. F. McMorrow

doi:10.1103/PhysRevB.97.184429

Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO3

J. G. Vale, S. Calder, C. Donnerer, D. Pincini, Y. G. Shi, Y. Tsujimoto, K. Yamaura, M. Moretti Sala, J. Van Den Brink, A. D. Christianson, D. F. McMorrow

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Abstract

NaOsO3 undergoes a metal-insulator transition (MIT) at 410 K, concomitant with the onset of antiferromagnetic order. The excitation spectra have been investigated through the MIT by resonant inelastic x-ray scattering (RIXS) at the Os L3 edge. Low resolution (ΔE∼300meV) measurements over a wide range of energies reveal that local electronic excitations do not change appreciably through the MIT. This is consistent with a picture in which structural distortions do not drive the MIT. In contrast, high resolution (ΔE∼56meV) 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 NaOsO3. In particular, the presence of weak correlations in the paramagnetic phase implies a degree of departure from the ideal Slater limit.

Original language	English
Article number	184429
Journal	Physical Review B
Volume	97
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.97.184429
State	Published - May 30 2018

Funding

J.G.V. thanks University College London (UCL) and École Polytechnique Fédérale de Lausanne (EPFL) for financial support through a UCL Impact award, and useful discussions with B. J. Blackburn, A. Princep, and E. Väisänen. Work at UCL was supported by the EPSRC (Grants No. EP/N027671/1 and No. EP/N034872/1). This research used resources at the High Flux Isotope Reactor and Spallation Neutron Source, DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory. K.Y. thanks financial support from JSPS KAKENHI (Grants No. 15K14133 and No. 16H04501). Y.G.S. was supported by the National Natural Science Foundation of China (Grants No. 11774399 and No. 11474330). All data created during this research are openly available from the UCL Discovery data archive.

Funders	Funder number
Engineering and Physical Sciences Research Council	EP/N034694/1, EP/N027671/1, EP/N034872/1
University College London
Japan Society for the Promotion of Science	16H04501, 15K14133
École Polytechnique Fédérale de Lausanne
National Natural Science Foundation of China	11474330, 11774399

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10.1103/PhysRevB.97.184429

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Vale, J. G., Calder, S., Donnerer, C., Pincini, D., Shi, Y. G., Tsujimoto, Y., Yamaura, K., Moretti Sala, M., Van Den Brink, J., Christianson, A. D., & McMorrow, D. F. (2018). Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO3. Physical Review B, 97(18), Article 184429. https://doi.org/10.1103/PhysRevB.97.184429

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abstract = "NaOsO3 undergoes a metal-insulator transition (MIT) at 410 K, concomitant with the onset of antiferromagnetic order. The excitation spectra have been investigated through the MIT by resonant inelastic x-ray scattering (RIXS) at the Os L3 edge. Low resolution (ΔE∼300meV) measurements over a wide range of energies reveal that local electronic excitations do not change appreciably through the MIT. This is consistent with a picture in which structural distortions do not drive the MIT. In contrast, high resolution (ΔE∼56meV) 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 NaOsO3. In particular, the presence of weak correlations in the paramagnetic phase implies a degree of departure from the ideal Slater limit.",

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AU - Calder, S.

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AU - Shi, Y. G.

AU - Tsujimoto, Y.

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AU - Christianson, A. D.

AU - McMorrow, D. F.

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N2 - NaOsO3 undergoes a metal-insulator transition (MIT) at 410 K, concomitant with the onset of antiferromagnetic order. The excitation spectra have been investigated through the MIT by resonant inelastic x-ray scattering (RIXS) at the Os L3 edge. Low resolution (ΔE∼300meV) measurements over a wide range of energies reveal that local electronic excitations do not change appreciably through the MIT. This is consistent with a picture in which structural distortions do not drive the MIT. In contrast, high resolution (ΔE∼56meV) 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 NaOsO3. In particular, the presence of weak correlations in the paramagnetic phase implies a degree of departure from the ideal Slater limit.

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Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO3

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