High-pressure Raman study of Bi2Sr2CaCu2O8+d: indications of strong bond-strength hierarchy and pressure-induced charge transfer

M. Osada, M. Kakihana, T. Asai, H. Arashi, M. Käll, L. Börjesson

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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 languageEnglish
JournalPhysica C: Superconductivity and its Applications
Volume341-348
DOIs
Publication statusPublished - 2000 Nov
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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