High-energy Cu spin excitations in PrBa2Cu3O6+x

A.T. Boothroyd, N.H. Andersen, B.H. Larsen, A.A. Zhokhov, C.D. Frost, D.T. Adroja

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    This paper describes high-energy neutron inelastic scattering measurements of propagating magnetic excitations in PrBa2Cu3O6+x (x approximate to 0.2 and 0.93). The measurements probe the acoustic and optic modes of the antiferromagnetically ordered copper-oxygen bilayers in the energy range 50-150 meV. The observed magnon dispersion can be described satisfactorily in this energy range by a spin wave model including intra- and inter-layer nearest-neighbor exchange constants J(parallel to) and J(perpendicular to). We find J(parallel to)=127 +/- 10 meV and J(perpendicular to)=5.5 +/- 0.9 meV. The value of J(parallel to) is virtually the same as that found in YBa2Cu3O6.2, but J(perpendicular to) is a factor of 2 smaller. To within experimental error the values of J(parallel to) and J(perpendicular to) for PrBa2Cu3O6+x, do not vary with oxygen doping.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Issue number9
    Pages (from-to)094514
    Number of pages6
    Publication statusPublished - 2005

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