Study of optical plasmons in La1.85Sr0.15Cu2O4

J. H. Kim, I. Bozovic, C. B. Eom, T. H. Geballe, J. S. Harris

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11 Citations (Scopus)


Reflectance and spectroellipsometric measurements were performed on a high-quality c-axis oriented La1.85Sr0.15CuO4 film to determine accurately the relevant spectral functions. The plasmon spectrum of La1.85CuO4 consists of an optic plasmon at about 0.8 eV and possibility a broad band of acoustic plasmons. The charactristic quadratic frequency dependence of the loss function, Im (-1/ge)=βω2 for ≤h{stroke}ω 〈 0.7 eV, has been observed. In view of similar behavior in YBa2Cu3O7, Bi2Sr 2CaCu2O8 and Tl2Ba2Ca2Cu3O10, this law seems to be universally obeyed in all high-Tc cuprate superconductors.

Original languageEnglish
Pages (from-to)435-439
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue number4-6
Publication statusPublished - 1991 Mar 15

Bibliographical note

Funding Information:
This research was supported by the U.S. Defense Advanced Research Projects Agency-U.S. Office of Naval Research under contract No. N00014-88-0760, by the U.S. Air Force Office of Scientific Research under contract No. F49620-88-C-004, and by the Stanford Center for Materials Research under NSFMRL program.

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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