title: Coupled magnetic excitations in single crystal PrBa(2)Cu(3)O(6.2).
abstract: The dispersion of the low-energy magnetic excitations of the Pr sublattice in PrBa(2)Cu(3)O(6.2) is determined by inelastic neutron scattering measurements on a single crystal. The dispersion, which shows the effect of interactions with the Cu spin waves, is well described by a model of the coupled Cu-Pr magnetic system. This model enables values for the principal exchange constants to be determined. The results suggest that both Pr-Pr and Cu-Pr interactions are important in producing the anomalously high ordering temperature of the Pr sublattice. Measurements of the Cu optic spin wave mode show that the interlayer Cu-Cu exchange is significantly lower than in YBa(2)Cu(3)O(6.2).
authors: Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom.
authors: S J
authors: SJ
authors: Lister
authors: A T
authors: AT
authors: Boothroyd
authors: N H
authors: NH
authors: Andersen
authors: B H
authors: BH
authors: Larsen
authors: A A
authors: AA
authors: Zhokhov
authors: A N
authors: AN
authors: Christensen
authors: A R
authors: AR
authors: Wildes