Pressure-induced effects in high-Tc superconductors: Raman scattering as a probe of charge-lattice dynamics under high pressure

M. Osada, M. Kakihana, M. Käll, L. Börjesson

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The Raman spectra of Bi2Sr2CaCu2O8+d (Bi2212) and YBa2Cu4O8 (Y124) have been investigated as a function of hydrostatic pressure. In both the overdoped Bi2212 and the underdoped Y124, the 140 cm-1 Cu mode exhibits a pronounced nonlinear pressure dependence which correlates to the dependence of Tc versus pressure. We argue that this behavior is a signature of charge-redistribution effects induced by compression. For Bi2212, we also find that the mode-specific Grüneisen parameters scale inversely with the corresponding phonon frequencies, a behavior which is reminiscent of phonon pressure dependences in molecular solids.

Original languageEnglish
Pages (from-to)142-145
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume357-360
Issue numberSUPPL. 2
DOIs
Publication statusPublished - 2001 Aug
Externally publishedYes

Keywords

  • BiSrCaCuO
  • High pressure
  • Raman scattering
  • YBa CuO

ASJC Scopus subject areas

  • Condensed Matter Physics

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