Lattice dynamics of the high-Tc superconductor YBa2Cu3O7−x
W. Kress, U. Schröder, J. Prade, A. D. Kulkarni, F. W. de Wette
DOI 10.1103/PhysRevB.38.2906 · Physical Review B
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Abstract
We present a lattice-dynamical calculation of the phonon dispersion curves and the one-phonon density of states of the high-Tc superconductor YBa2Cu3O7−x in the framework of a shell model, which is based on a short-range overlap and long-range Coulomb potentials. The parameters of these potentials are obtained from best fits to the measured phonon dispersion curves of BaTiO3 and appropriate metal oxides. The model for YBa2Cu3O7−x so obtained leads to rather satisfactory agreement with the available ir and Raman data without any major adjustments of the potential parameters. These results thus provide a solid basis for the discussion of the role of phonons for the high transition temperature and a guide for further experimental studies of the vibrational properties of this and related compounds.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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