Abstract
Phonon Raman scattering from slightly overdoped Bi 2Sr 2CaCu 2O 8+ d (Bi2212) samples have been investigated under hydrostatic pressure up to 7.2 GPa. The mode-specific Grüneisen 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 −1Cu mode exhibits a pronounced nonlinear pressure dependence which correlates to the dependence of T c 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.
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