Anomalous phonon behavior of superconductor Y-Ba-Cu-O
Abstract
The generalized phonon density of states of Y-Ba-Cu-O superconductor (T(sub c) = 90.5 K) have been measured at 289 K and 87 K respectively, by using Be filter detector neutron inelastic scattering spectrometer at Institute of Atomic Energy. At 87 K, the optical mode at 76 MeV which is estimated owing to Cu-O-Cu breathing mode and a stronger acoustic mode below 6 MeV are observed, and the low frequency modes at 10 MeV and 19 MeV in 289 K seems to have disappeared, or to be softened. It is possible that the anomalous change of phonon density of states below T(sub c) is responsible for the higher superconducting transition temperature of Y-Ba-Cu-O.
- Publication:
-
Unknown
- Pub Date:
- 1987
- Bibcode:
- 1987apbs.rept.....R
- Keywords:
-
- Anomalies;
- Nuclear Reactions;
- Phonons;
- Superconductors;
- Barium;
- Copper;
- Inelastic Scattering;
- Low Temperature;
- Neutrons;
- Oxides;
- Transition Temperature;
- Yttrium;
- Solid-State Physics