Abstract
Phonon Raman scattering from slightly overdoped Bi2Sr2CaCu2O8+d (Bi2212) samples have been investigated under hydrostatic pressure up to 7.2 GPa. The mode-specific Gruneisen parameters scale inversely with the corresponding phonon frequencies, the behavior of which is reminiscent of phonon pressure dependences in molecular solids. We also find that the 140 cm-1 Cu mode exhibits a pronounced nonlinear pressure dependence which correlates to the dependence of Tc versus pressure. The data are interpreted in terms of a non-uniform structural compressibility that results in a redistribution of charge carriers within the Bi2212 unit-cell.
Original language | English |
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Pages (from-to) | 2241-2242 |
Number of pages | 2 |
Journal | Physica C: Superconductivity and its applications |
Volume | 341-348 (IV) |
DOIs | |
Publication status | Published - 2000 Nov |
Externally published | Yes |
Event | International Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI - Houston, TX, USA Duration: 2000 Feb 20 → 2000 Feb 25 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering