Far-infrared optical conductivity of YBCO single crystal thin films from transmission and reflection spectra

H. Shibata, S. Kimura, S. Kashiwaya, S. Ueno, M. Koyanagi, N. Terada, E. Kawate, P. Fons, Y. Tanaka

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A new method to characterize the optical constants of thin films has been developed, and applied to YBa2Cu3O7-x epitaxial single crystal thin films (Tc = 90 K) grown on MgO substrates to determine the far-infrared optical conductivity σab(ω). In this method, both the transmittance and the reflectance spectra are measured and the results are substituted into a set of coupled equations which describe exactly the transmittance and reflectance of thin films on substrates, where the complex refractive indices n and k of the thin films are unknown parameters. The coupled equations are numerically solved by the Newton method, and the values of n and k are determined as functions of the wavenumber ω. We have determined σab(ω) for YBa2Cu3O7-x thin films in the range ω = 50-250 cm-1 and T = 34-97 K. Analysis of the temperature dependence of σab(ω) based on the two-fluid model suggests that the symmetry of the superconducting pairing state of the specimen is d-wave.

Original languageEnglish
Pages (from-to)253-256
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Volume62
Issue number1-2
DOIs
Publication statusPublished - 2001 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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