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

研究成果: Article

2 引用 (Scopus)


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.

ジャーナルPhysica C: Superconductivity and its Applications
出版物ステータスPublished - 2000 11


ASJC Scopus subject areas

  • Condensed Matter Physics