Go Back to Previous Page
|
Info for "Plasmons in high-temperature superconductors
"Author: J. H. Kim, I. Bozovic, J. S. Harris, W. Y. Lee, C. B. Eom, T. H. Geballe and E. S. Hellman
Reference Type: Journal Article
Link: Click Here
Year Published: 1991
Journal: Physica C: Superconductivity
, Volume 185-189
, Issue Part 2
Pages: 1019-1020
Abstract: 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/[epsilon]) = [beta][omega]2, nearly up to the screened plasma frequency. We propose that this characteristic quadratic frequency dependence is universally obeyed in all high-Tc superconductors.
|
