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This paper describes high-energy neutron inelastic scattering measurements ofpropagating magnetic excitations in PrBa2Cu3O6+x (x approx 0.2 and 0.93). Themeasurements probe the acoustic and optic modes of theantiferromagnetically-ordered copper--oxygen bilayers in the energy range50-150 meV. The observed magnon dispersion can be described satisfactorily inthis energy range by a spin wave model including intra- and inter-layernearest-neighbour exchange constants J_parallel and J_perp. We find J_parallel= 127 +/- 10 meV and J_perp = 5.5 +/- 0.9 meV. The value of J_parallel isvirtually the same as that found in YBa2Cu3O6.2, but J_perp is a factor of twosmaller. To within experimental error the values of J_parallel and J_perp forPrBa2Cu3O6+x do not vary with oxygen doping.

physical review. b, condensed matter and materials physics

High-energy Cu spin excitations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi><mml:msub><mml:mi mathvariant="normal">Ba</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>6</mml:mn><mml:mo>+</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

High-energy Cu spin excitations inPrBa2Cu3O6+x