Phonon Dispersion Relations in PrBa2Cu3O6+x (x ~ 0.2)
C. H. Gardiner, A. T. Boothroyd, B. H. Larsen, W. Reichardt, A. A., Zhokhov, N. H. Andersen, S. J. S. Lister, A. R. Wildes
TL;DR
This study measures phonon dispersion in oxygen-deficient PrBa2Cu3O6+x using neutron scattering, revealing deviations from models especially involving oxygen ions, and compares findings with YBa2Cu3O6.
Contribution
It provides detailed phonon dispersion data for PrBa2Cu3O6+x and compares it with a lattice dynamics model, highlighting discrepancies related to oxygen ion motions.
Findings
Most phonon branches match the model
Two phonon modes are softer than predicted
Oxygen ions in CuO2 planes dominate the anomalous modes
Abstract
We report measurements of the phonon dispersion relations in non-superconducting, oxygen-deficient PrBa2Cu3O6+x (x ~ 0.2) by inelastic neutron scattering. The data are compared with a model of the lattice dynamics based on a common interaction potential. Good agreement is achieved for all but two phonon branches, which are significantly softer than predicted. These modes are found to arise predominantly from motion of the oxygen ions in the CuO2 planes. Analogous modes in YBa2Cu3O6 are well described by the common interaction potential model.
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