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Polarized and unpolarized neutron-scattering study of the dynamical spin susceptibility of YBa2Cu3O7
 

Summary: Polarized and unpolarized neutron-scattering study of the dynamical spin susceptibility
of YBa2Cu3O7
H. F. Fong
Department of Physics, Princeton University, Princeton, New Jersey 08544
B. Keimer
Department of Physics, Princeton University, Princeton, New Jersey 08544
and Department of Physics, Brookhaven National Laboratory, Upton, New York 11973
D. Reznik
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973
and National Institute of Standards and Technology, Gaithersburg, Maryland 20899
D. L. Milius and I. A. Aksay
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544
Received 4 January 1996
We report an extensive study of magnetic excitations in fully oxygenated YBa2Cu3O7 , using neutron scat-
tering with and without spin polarization analysis. By calibrating the measured magnetic intensity against
calculated structure factors of optical phonons and against antiferromagnetic spin waves measured in the same
crystal after deoxygenation to YBa2Cu3O6.2, we establish an absolute intensity scale for the dynamical spin
susceptibility, q, . The integrated spectral weight of the sharp magnetic resonance at 40 meV and
q ( /a, /a) in the superconducting state is d( ) res(q, ) (0.52 0.1) at low temperatures. The en-
ergy and spectral weight of the resonance are measured up to T 0.8Tc . The resonance disappears in the

  

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

 

Collections: Materials Science