Magnetic excitations of the Cu2+ quantum spin chain in Sr3CuPtO6

J. C. Leiner, Joosung Oh, A. I. Kolesnikov, M. B. Stone, Manh Duc Le, E. P. Kenny, B. J. Powell, M. Mourigal, E. E. Gordon, M. H. Whangbo, J. W. Kim, S. W. Cheong, Je Geun Park

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Abstract

We report the magnetic excitation spectrum as measured by inelastic neutron scattering for a polycrystalline sample of Sr3CuPtO6. Modeling the data by the 2+4 spinon contributions to the dynamical susceptibility within the chains, and with interchain coupling treated in the random phase approximation, accounts for the major features of the powder-averaged structure factor. The magnetic excitations broaden considerably as temperature is raised, persisting up to above 100 K and displaying a broad transition as previously seen in the susceptibility data. No spin gap is observed in the dispersive spin excitations at low momentum transfer, which is consistent with the gapless spinon continuum expected from the coordinate Bethe ansatz. However, the temperature dependence of the excitation spectrum gives evidence of some very weak interchain coupling.

Original languageEnglish (US)
Article number104426
JournalPhysical Review B
Volume97
Issue number10
DOIs
StatePublished - Mar 30 2018

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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