Coupled magnetic excitations in single crystal PrBa(2)Cu(3)O(6.2)

S J Lister; A T Boothroyd; N H Andersen; B H Larsen; A A Zhokhov; A N Christensen; A R Wildes

doi:10.1103/PhysRevLett.86.5994

Coupled magnetic excitations in single crystal PrBa(2)Cu(3)O(6.2)

Phys Rev Lett. 2001 Jun 25;86(26 Pt 1):5994-7. doi: 10.1103/PhysRevLett.86.5994.

Authors

S J Lister¹, A T Boothroyd, N H Andersen, B H Larsen, A A Zhokhov, A N Christensen, A R Wildes

Affiliation

¹ Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom.

PMID: 11415412
DOI: 10.1103/PhysRevLett.86.5994

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).