Plasmons in high-temperature superconductors

J. H. Kim, I. Bozovic, J. S. Harris, W. Y. Lee, C. B. Eom, T. H. Geballe, E. S. Hellman

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Plasmon spectra of free carriers in high-Tc cuprates and bismates are investigated via their complex dielectric functions, which are accurately determined by combining reflectance and spectroellipsometric measurements. All five superconductors under study exhibit a single optic plasmon located at 0.8 eV for La1.85Sr0.15CuO4, 1.4 eV for YBa2Cu3O7, 1.0 eV for Bi2Sr2CaCu2O8, 1.2 eV for Tl2Ba2Ca2Cu3O10, and 1.5 eV for Ba0.54K 0.46BiO3. The low-energy part of the dielectric loss function of each system is quadratic with frequency: Im(-1/ε{lunate}) = βω2, nearly up to the screened plasma frequency. We propose that this characteristic quadratic frequency dependence is universally obeyed in all high-Tc superconductors.

Original languageEnglish
Pages (from-to)1019-1020
Number of pages2
JournalPhysica C: Superconductivity and its applications
Issue numberPART 2
Publication statusPublished - 1991 Dec 1

All Science Journal Classification (ASJC) codes

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


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