Strength of infrared phonons in R Ba2Cu3O7−x ceramic superconductors

✍ Scribed by A. Memon; M.N. Khan; S. Al-Dallal; D.B. Tanner; C.D. Porter

• Book ID: 103944933
• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 196 KB
• Volume: 185-189
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)91728-m

✦ Synopsis

The infrared reflectance spectra for mixed rare earths and lanthanides ceramic superconductors were measured in the normal state at ambient temperature. The dielectric response function obtained by Kramer-ILronig analysis of the reflectance data is analyzed using a four component dielectric response model. The Drude parameter results show that the oscillator strength of the phonon modes reduced as Yittrium is partially replaced by Europium and Gadolinium. The infrared d.c. conductivity calculated from the oscillator model fit and from K-K analysis, disagree with the four probe d.c. conductivity. The critical temperature of R Ba2Cu307. x superconductors reduces systematically on partial substitution of Yittrium by lanthanides.