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Strongly Gapped Spin-Wave Excitation in the Insulating Phase of NaOsO3

Calder, S; Vale, JG; Bogdanov, N; Donnerer, C; Sala, MM; Liu, X; Upton, MH; ... Christianson, AD; + view all (2017) Strongly Gapped Spin-Wave Excitation in the Insulating Phase of NaOsO3. Physical Review B , 95 (2) , Article 020413(R). 10.1103/PhysRevB.95.020413. Green open access

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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=13.9 meV). The observed behavior places NaOsO3 on the boundary between localized and itinerant magnetism.

Type: Article
Title: Strongly Gapped Spin-Wave Excitation in the Insulating Phase of NaOsO3
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.95.020413
Publisher version: http://doi.org/10.1103/PhysRevB.95.020413
Language: English
Additional information: © 2017 American Physical Society
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1529019
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