Phonon and magnetic neutron scattering at 41 meV in YBa2Cu3O7

Hung Fai Fong, B. Keimer, P. W. Anderson, D. Reznik, F. Doǧan, Ilhan A. Aksay

Research output: Contribution to journalArticlepeer-review

370 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)316-319
Number of pages4
JournalPhysical review letters
Issue number2
StatePublished - 1995

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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