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

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arxiv 1608.08477 v2 pith:ORBJZXCB submitted 2016-08-30 cond-mat.str-el cond-mat.mtrl-sci

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
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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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classification cond-mat.str-el cond-mat.mtrl-sci
keywords exchangeexcitationmagneticnaoso3gappedinteractionsobservedstrongly
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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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