Phonon Dispersion Relations in PrBa2Cu3O6+x (x ~ 0.2)

Details Phonon Dispersion Relations in PrBa2Cu3O6+x (x ~ 0.2) Phonon Dispersion Relations in PrBa2Cu3O6+x (x ~ 0.2)

2003-10-23

arxiv.org/abs/cond-mat/0310555v2

Physical Review B, 69, 092302 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures. Minor changes following referees' comments

Scientific paper

10.1103/PhysRevB.69.092302

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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