High-Frequency Spin Waves in YBa2Cu3O6.15

Details High-Frequency Spin Waves in YBa2Cu3O6.15 High-Frequency Spin Waves in YBa2Cu3O6.15

1996-05-22

arxiv.org/abs/cond-mat/9605139v2

Phys. Rev. B vol. 54, R6905 (1996)

Physics

Condensed Matter

postscript, 11 pages, 4 figures, Fig.2 fixed

Scientific paper

10.1103/PhysRevB.54.R6905

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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