title: High-resolution study of spin excitations in the singlet ground state of SrCu2(BO3)2.
abstract: High-resolution, inelastic neutron scattering measurements on SrCu2(BO3)2, a realization of the Shastry-Sutherland model for two-dimensional Heisenberg antiferromagnets, reveal the dispersion of the three single triplet excitations continuously across the (H,0) direction within its tetragonal basal plane. These measurements also show distinct Q dependencies for the single and multiple triplet excitations, and that these excitations are largely dispersionless perpendicular to this plane. The temperature dependence of the intensities of these excitations is well described as the complement of the dc susceptibility of SrCu2(BO3)2.
authors.affiliation: Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada.
authors.forename: B D
authors.initials: BD
authors.lastname: Gaulin
authors.forename: S H
authors.initials: SH
authors.lastname: Lee
authors.forename: S
authors.initials: S
authors.lastname: Haravifard
authors.forename: J P
authors.initials: JP
authors.lastname: Castellan
authors.forename: A J
authors.initials: AJ
authors.lastname: Berlinsky
authors.forename: H A
authors.initials: HA
authors.lastname: Dabkowska
authors.forename: Y
authors.initials: Y
authors.lastname: Qiu
authors.forename: J R D
authors.initials: JR
authors.lastname: Copley