High-energy Cu spin excitations in PrBa2Cu3O6+x
Abstract
This paper describes high-energy neutron inelastic scattering measurements of propagating magnetic excitations in PrBa2Cu3O6+x (x approx 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-neighbour exchange constants Jparallel and Jperp. We find Jparallel = 127 +/- 10 meV and Jperp = 5.5 +/- 0.9 meV. The value of Jparallel is virtually the same as that found in YBa2Cu3O6.2, but Jperp is a factor of two smaller. To within experimental error the values of Jparallel and Jperp for PrBa2Cu3O6+x do not vary with oxygen doping.
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