Phonon Raman scattering of Bi2Sr2CaCu2O8+d under hydrostatic pressure

Minoru Osada, Masato Kakihana, Haruo Arashi, Mikael Käil, Lars Börjesson

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Abstract

Phonon Raman scattering from slightly overdoped Bi2Sr2CaCu2O8+d samples have been investigated under hydrostatic pressure up to 7.2 GPa. Although most observed phonons harden linearly with increasing pressure, the Alg-type Cu mode at 140 cm-1 exhibits a nonlinear hardening with an inflection point around 2 GPa, similar to the dependence of Tc versus pressure. We also find that the mode-specific Grüneisen parameters scale inversely with the corresponding vibrational frequencies, a trend similar to what is observed for molecular solids. The data are interpreted in terms of a nonuniform structural compressibility that results in a redistribution of charge carriers within the Bi2Sr2CaCu2O8+d unit cell.

Original languageEnglish
Pages (from-to)8447-8450
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number13
Publication statusPublished - 1999
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Osada, M., Kakihana, M., Arashi, H., Käil, M., & Börjesson, L. (1999). Phonon Raman scattering of Bi2Sr2CaCu2O8+d under hydrostatic pressure. Physical Review B - Condensed Matter and Materials Physics, 59(13), 8447-8450.