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

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 5d(3) system. The excitation is well described within a minimal model Hamiltonian with strong anisotropy and Heisenberg exchange (J(1) = J(2) = 13.9 meV). The observed behavior places NaOsO3 on the boundary between localized and itinerant magnetism.


Published in:
Physical Review B, 95, 2, 020413
Year:
2017
Publisher:
College Pk, Amer Physical Soc
ISSN:
2469-9950
Laboratories:




 Record created 2017-05-01, last modified 2018-03-17


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