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High-Frequency Spin Waves in YBa2Cu3O6.15

S. M. Hayden·G. Aeppli·T. G. Perring·H. A. Mook·F. Dogan
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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 J_parallel =125 meV and J_perp = 11 meV respectively and a spin-wave intensity renormalization Z_chi = 0.4.

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S. M. Hayden, G. Aeppli, T. G. Perring, H. A. Mook, F. Dogan. 1996-05-25. High-Frequency Spin Waves in YBa2Cu3O6.15. https://doi.org/10.1103/physrevb.54.r6905

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