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: Conference article査読

3 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)2241-2242
ページ数2
ジャーナルPhysica C: Superconductivity and its applications
341-348 (IV)
DOI
出版ステータスPublished - 2000 11月
外部発表はい
イベントInternational Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI - Houston, TX, USA
継続期間: 2000 2月 202000 2月 25

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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