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

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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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    Kim, J. H., Bozovic, I., Harris, J. S., Lee, W. Y., Eom, C. B., Geballe, T. H., & Hellman, E. S. (1991). Plasmons in high-temperature superconductors. Physica C: Superconductivity and its applications, 185-189(PART 2), 1019-1020.