Abstract

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.

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

1631829

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 1996 American Physical Society (APS), All rights reserved.

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