High Resolution Inelastic Neutron Scattering Study of Phonon Self-Energy Effects in YBCO
We report preliminary results of the high resolution inelastic neutron scattering measurements of the 42.5 meV optical phonon branch in YBCO, whose behavior at momentum transfer q=0 has been extensively studied by Raman scattering. The experiment was done on a large (75g) single crystal of YBa2Cu3O7-x (Tc~90K) with the resolution of 2 meV (full width at half maximum). In cooling from 100K to 50K we observe a small softening of the phonon energy at q= 0.25, 0.25, 0, but no significant linewidth change.
D. V. Reznik et al., "High Resolution Inelastic Neutron Scattering Study of Phonon Self-Energy Effects in YBCO," Physica C: Superconductivity and its applications, vol. 235-240, no. PART 3, pp. 1733-1734, Elsevier, Dec 1994.
The definitive version is available at http://dx.doi.org/10.1016/0921-4534(94)92088-5
Materials Science and Engineering
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