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VOLUME 75, NUMBER 2 P H Y S I C A L R E V I E W L E T T E R S 10 JULY 1995 Phonon and Magnetic Neutron Scattering at 41 meV in YBa2Cu3O7
 

Summary: VOLUME 75, NUMBER 2 P H Y S I C A L R E V I E W L E T T E R S 10 JULY 1995
Phonon and Magnetic Neutron Scattering at 41 meV in YBa2Cu3O7
Hung Fai Fong, B. Keimer, and P. W. Anderson
Department of Physics, Princeton University, Princeton, New Jersey 08544
D. Reznik
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
F. Dogan* and I. A. Aksay
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544
(Received 22 December 1994)
We report inelastic neutron scattering measurements at excitation energies »hv 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 p a, p 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 p a, p a appears in the superconducting state only. Theoretical implications of these findings
are discussed.
PACS numbers: 74.25.Jb, 74.25.Kc, 74.72.Bk
An important experimental constraint on microscopic
models of the normal and superconducting states of the
copper oxide superconductors is the generalized magnetic

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science