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
TL;DR
This study uses resonant inelastic x-ray scattering to reveal a strongly gapped spin-wave excitation in NaOsO3, highlighting significant spin-orbit coupling and placing the material at the boundary between localized and itinerant magnetism.
Contribution
It provides the first direct measurement of magnetic exchange interactions in NaOsO3, demonstrating a strongly gapped excitation and the importance of spin-orbit coupling in this 5d3 system.
Findings
Observed a 58 meV gapped spin-wave excitation
Identified strong anisotropy and Heisenberg exchange interactions
Placed NaOsO3 at the boundary between localized and itinerant magnetism
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.
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