High-energy Cu spin excitations in PrBa2Cu3O6+x

Journal article

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.

Authors: Boothroyd, A; Andersen, N; Larsen, B; Zhokhov, A; Frost, C

• Publication status: Published
• Journal: Phys. Rev. B
• Volume: 71
• Issue: 9
• Pages: 094514
• Publication date: 2005-02-18
• DOI: 10.1103/PhysRevB.71.094514
• EISSN: 1550-235X
• ISSN: 1098-0121
• Keywords: cond-mat.supr-con; cond-mat.str-el