High-Frequency Spin Waves in YBa2Cu3O6.15

F. Dogan (University of Washington); G. Aeppli (AT&T Bell Laboratories); H. A. Mook (Oak Ridge National Laboratory); S. M. Hayden (University of Bristol); T. G. Perring (Rutherford Laboratory)

arxiv: cond-mat/9605139 · v2 · submitted 1996-05-22 · ❄️ cond-mat

High-Frequency Spin Waves in YBa2Cu3O6.15

S. M. Hayden (University of Bristol) , G. Aeppli (AT&T Bell Laboratories) , T. G. Perring (Rutherford Laboratory) , H. A. Mook (Oak Ridge National Laboratory) , F. Dogan (University of Washington) This is my paper

classification ❄️ cond-mat

keywords modesopticalyba2cu3o6absoluteacousticadjacentappearconstants

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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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High-Frequency Spin Waves in YBa2Cu3O6.15

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