Strongly gapped spin-wave excitation in the insulating phase of NaOsO3

S. Calder; J. G. Vale; N. Bogdanov; C. Donnerer; D. Pincini; M. Moretti Sala; X. Liu; M. H. Upton; D. Casa; Y. G. Shi; Y. Tsujimoto; K. Yamaura; J. P. Hill; J. Van Den Brink; D. F. McMorrow; A. D. Christianson

doi:10.1103/PhysRevB.95.020413

Strongly gapped spin-wave excitation in the insulating phase of NaOsO3

S. Calder, J. G. Vale, N. Bogdanov, C. Donnerer, D. Pincini, M. Moretti Sala, X. Liu, M. H. Upton, D. Casa, Y. G. Shi, Y. Tsujimoto, K. Yamaura, J. P. Hill, J. Van Den Brink, D. F. McMorrow, A. D. Christianson

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Abstract

NaOsO3 hosts a rare manifestation of a metal-insulator transition driven by magnetic correlations, placing the magnetic exchange interactions in a central role. We use resonant inelastic x-ray scattering to directly probe these magnetic exchange interactions. A dispersive and strongly gapped (58 meV) excitation is observed, indicating appreciable spin-orbit coupling in this 5d3 system. The excitation is well described within a minimal model Hamiltonian with strong anisotropy and Heisenberg exchange (J1=J2=13.9meV). The observed behavior places NaOsO3 on the boundary between localized and itinerant magnetism.

Original language	English
Article number	020413
Journal	Physical Review B
Volume	95
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.95.020413
State	Published - Jan 23 2017

Funding

This work in London was supported by the UK Engineering and Physical Sciences Research Council (EPSRC). J.G.V. would like to thank UCL and EPFL for financial support via a UCL Impact Studentship. X.L. acknowledges financial support from MOST (No. 2015CB921302) and CAS (No. XDB07020200) of China. Work done at Brookhaven National Laboratory was supported by US DOE, Division of Materials Science, under Contract No. DE-SC00112704. K.Y. thanks financial support from JSPS KAKENHI (15K14133 and 16H04501).

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Calder, S., Vale, J. G., Bogdanov, N., Donnerer, C., Pincini, D., Moretti Sala, M., Liu, X., Upton, M. H., Casa, D., Shi, Y. G., Tsujimoto, Y., Yamaura, K., Hill, J. P., Van Den Brink, J., McMorrow, D. F., & Christianson, A. D. (2017). Strongly gapped spin-wave excitation in the insulating phase of NaOsO3. Physical Review B, 95(2), Article 020413. https://doi.org/10.1103/PhysRevB.95.020413

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abstract = "NaOsO3 hosts a rare manifestation of a metal-insulator transition driven by magnetic correlations, placing the magnetic exchange interactions in a central role. We use resonant inelastic x-ray scattering to directly probe these magnetic exchange interactions. A dispersive and strongly gapped (58 meV) excitation is observed, indicating appreciable spin-orbit coupling in this 5d3 system. The excitation is well described within a minimal model Hamiltonian with strong anisotropy and Heisenberg exchange (J1=J2=13.9meV). The observed behavior places NaOsO3 on the boundary between localized and itinerant magnetism.",

author = "S. Calder and Vale, {J. G.} and N. Bogdanov and C. Donnerer and D. Pincini and {Moretti Sala}, M. and X. Liu and Upton, {M. H.} and D. Casa and Shi, {Y. G.} and Y. Tsujimoto and K. Yamaura and Hill, {J. P.} and {Van Den Brink}, J. and McMorrow, {D. F.} and Christianson, {A. D.}",

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AU - Vale, J. G.

AU - Bogdanov, N.

AU - Donnerer, C.

AU - Pincini, D.

AU - Moretti Sala, M.

AU - Liu, X.

AU - Upton, M. H.

AU - Casa, D.

AU - Shi, Y. G.

AU - Tsujimoto, Y.

AU - Yamaura, K.

AU - Hill, J. P.

AU - Van Den Brink, J.

AU - McMorrow, D. F.

AU - Christianson, A. D.

PY - 2017/1/23

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AB - NaOsO3 hosts a rare manifestation of a metal-insulator transition driven by magnetic correlations, placing the magnetic exchange interactions in a central role. We use resonant inelastic x-ray scattering to directly probe these magnetic exchange interactions. A dispersive and strongly gapped (58 meV) excitation is observed, indicating appreciable spin-orbit coupling in this 5d3 system. The excitation is well described within a minimal model Hamiltonian with strong anisotropy and Heisenberg exchange (J1=J2=13.9meV). The observed behavior places NaOsO3 on the boundary between localized and itinerant magnetism.

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Strongly gapped spin-wave excitation in the insulating phase of NaOsO3

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