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

Research output: Contribution to journalConference articlepeer-review

2 Citations (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.

Original languageEnglish
Pages (from-to)2241-2242
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume341-348 (IV)
Publication statusPublished - 2000 Nov
Externally publishedYes
EventInternational Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI - Houston, TX, USA
Duration: 2000 Feb 202000 Feb 25

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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