We report inelastic neutron scattering measurements at excitation energies Latin small letter h with strokeω~41 meV in YBa2Cu3O7. We separate magnetic and phonon contributions to the scattering cross section by a detailed analysis of the momentum dependence of the scattered intensity. The previously reported broad peak around q=(π/a,π/a) in the normal state can be entirely accounted for by a phonon which primarily involves vibrations of the in-plane oxygen. Magnetic scattering centered around 41 meV and q=(π/a,π/a) appears in the superconducting state only. Theoretical implications of these findings are discussed.
H. Fong et al., "Phonon and Magnetic Neutron Scattering at 41 Mev in YBa₂Cu₃O₇," Physical Review Letters, vol. 75, no. 2, pp. 316-319, American Physical Society (APS), Jul 1995.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.75.316
Materials Science and Engineering
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Article - Journal
© 1995 American Physical Society (APS), All rights reserved.
01 Jul 1995