High-Frequency Spin Waves in YBa2Cu3O6.15
S. M. Hayden, G. Aeppli, T. G. Perring, H. A. Mook, F. Dogan
Abstract
Pulsed neutron spectroscopy is used to make absolute measurements of the dynamic magnetic susceptibility of insulating YBa2Cu3O6.15. Acoustic and optical modes, derived from in- and out-of-phase oscillation of spins in adjacent CuO2 planes, dominate the spectra and are observed up to 250 meV. The optical modes appear first at 74 meV. Linear-spin-wave theory gives an excellent description of the data and yields intra- and inter-layer exchange constants of Jparallel =125 meV and Jperp = 11 meV respectively and a spin-wave intensity renormalization Zchi = 0.4.
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