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.
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Calder, S., Vale, J. G., Bogdanov, N., Donnerer, C., Pincini, D., Sala, M. 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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WOS:000398728100004
2017
95
2
020413
REVIEWED
EPFL