High-energy Cu spin excitations in PrBa2Cu3O6+x

Details High-energy Cu spin excitations in PrBa2Cu3O6+x High-energy Cu spin excitations in PrBa2Cu3O6+x

2005-02-18

arxiv.org/abs/cond-mat/0502467v1

Phys. Rev. B 71, 094514 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 5 figures. To be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.71.094514

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 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 is virtually the same as that found in YBa2Cu3O6.2, but J_perp is a factor of two smaller. To within experimental error the values of J_parallel and J_perp for PrBa2Cu3O6+x do not vary with oxygen doping.

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