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Direct observation of optical magnons in YBa2Cu3O6.2 D. Reznik* and P. Bourges
 

Summary: Direct observation of optical magnons in YBa2Cu3O6.2
D. Reznik* and P. Bourges
Laboratoire Le´on Brillouin, CEA, CNRS, CEA-Saclay, 91191 Gif-sur-Yvette, France
H. F. Fong
Department of Physics, Princeton University, Princeton, New Jersey 08544
L. P. Regnault
De´partement de Recherche Fondamentale sur la Matie`re Condense´e, Service de Physique Statistique, Magne´tisme et Supraconductivite´,
Groupe Magne´tisme et Diffraction Neutronique, CEA-Grenoble, 38054 Grenoble, Cedex 9, France
J. Bossy
Institut Laue-Langevin, 38042 Grenoble, Cedex, France
C. Vettier
European Synchrotron Research Facility, Boi^te Postale No. 220, 38043 Grenoble, Cedex, France
D. L. Milius and I. A. Aksay
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544
B. Keimer
Department of Physics, Princeton University, Princeton, New Jersey 08544
Received 4 January 1996
We have used high-energy inelastic neutron scattering to detect optical magnons directly in antiferromag-
netic YBa2Cu3O6.2. The optical magnon gap is 67 5 meV. This implies an intrabilayer superexchange con-
stant perpendicular to the CuO2 layers of J 0.08J where J is the in-plane nearest-neighbor superexchange

  

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

 

Collections: Materials Science