Evolution of the Magnetic Excitations in NaOsO3 through its Metal-Insulator Transition

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/PhysRevLett.120.227203

Evolution of the Magnetic Excitations in NaOsO3 through its Metal-Insulator Transition

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

The temperature dependence of the excitation spectrum in NaOsO3 through its metal-to-insulator transition (MIT) at 410 K has been investigated using resonant inelastic x-ray scattering at the Os L3 edge. High-resolution (ΔE∼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 NaOsO3 [J. G. Vale, S. Calder, C. Donnerer, D. Pincini, Y. G. Shi, Y. Tsujimoto, K. Yamaura, M. M. Sala, J. van den Brink, A. D. Christianson, and D. F. McMorrow, Phys. Rev. B 97, 184429 (2018)PRBMDO2469-995010.1103/PhysRevB.97.184429].

Original language	English
Article number	227203
Journal	Physical Review Letters
Volume	120
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevLett.120.227203
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 Engineering and Physical Sciences Research Council (Grants No. EP/N027671/1 and No. EP/N034872/1). This research used resources at the High Flux Isotope Reactor and Spallation Neutron Source, Department of Energy (DOE) Office of Science User Facilities operated by the Oak Ridge National Laboratory. K. Y. was supported by the Japan Society for the Promotion of Science KAKENHI (Grants No. 15K14133 and No. 16H04501). Y. G. S. was supported by the National Natural Science Foundation of China (Grants No. 11774399, No. 11474330). All data presented in this work 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/PhysRevLett.120.227203

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title = "Evolution of the Magnetic Excitations in NaOsO3 through its Metal-Insulator Transition",

abstract = "The temperature dependence of the excitation spectrum in NaOsO3 through its metal-to-insulator transition (MIT) at 410 K has been investigated using resonant inelastic x-ray scattering at the Os L3 edge. High-resolution (ΔE∼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 NaOsO3 [J. G. Vale, S. Calder, C. Donnerer, D. Pincini, Y. G. Shi, Y. Tsujimoto, K. Yamaura, M. M. Sala, J. van den Brink, A. D. Christianson, and D. F. McMorrow, Phys. Rev. B 97, 184429 (2018)PRBMDO2469-995010.1103/PhysRevB.97.184429].",

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N2 - The temperature dependence of the excitation spectrum in NaOsO3 through its metal-to-insulator transition (MIT) at 410 K has been investigated using resonant inelastic x-ray scattering at the Os L3 edge. High-resolution (ΔE∼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 NaOsO3 [J. G. Vale, S. Calder, C. Donnerer, D. Pincini, Y. G. Shi, Y. Tsujimoto, K. Yamaura, M. M. Sala, J. van den Brink, A. D. Christianson, and D. F. McMorrow, Phys. Rev. B 97, 184429 (2018)PRBMDO2469-995010.1103/PhysRevB.97.184429].

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Evolution of the Magnetic Excitations in NaOsO3 through its Metal-Insulator Transition

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