Pulsed neutron spectroscopy is used to absolute measurements of the dynamic magnetic susceptibility of insulating YBa2Cu3O6.15. Acoustic and optical modes, derived from inand 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±5 meV. Linear-spin-wave theory gives an excellent description of the data and yields intralayer and interlayer exchange constants of J∥=125±5 meV and J⊥=11±2 meV, respectively, and a spin-wave intensity renormalization ZΧ=0.4±0.1.
S. M. Hayden et al., "High-Frequency Spin Waves in YBa2Cu3O6.15>/sub>," Physical Review B - Condensed Matter and Materials Physics, vol. 54, no. 10, pp. R6905-R6908, American Physical Society (APS), Jan 1996.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevB.54.R6905
Materials Science and Engineering
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