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VOLUME 75, NUMBER 12 P H Y S I C A L R E V I E W L E T T E R S 18 SEPTEMBER 1995 q Dependence of Self-Energy Effects of the Plane Oxygen Vibration in YBa2Cu3O7
 

Summary: VOLUME 75, NUMBER 12 P H Y S I C A L R E V I E W L E T T E R S 18 SEPTEMBER 1995
q Dependence of Self-Energy Effects of the Plane Oxygen Vibration in YBa2Cu3O7
D. Reznik
Materials Science Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
and Department of Physics, Brookhaven National Laboratory, Upton, New York 11973
B. Keimer
Department of Physics, Princeton University, Princeton, New Jersey 08544
F. Dogan* and I. A. Aksay
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544
(Received 27 April 1995)
We have measured the temperature dependence of the peak position and linewidth of the 42.5 meV
phonon branch in a twinned single crystal of YBa2Cu3O7 as a function of wave vector q. In the
100 010 direction in the Brillouin zone, considerable softening and broadening occur below the
superconducting transition temperature Tc at some values of q. We observe an order of magnitude
smaller softening and no linewidth broadening for q in the 110

110

direction. Possible implications
of these findings for the symmetry of the superconducting order parameter are discussed.

  

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

 

Collections: Materials Science