Correlation between plasma frequency and superconducting transition temperature in YBa2Cu3Oy

✍ Scribed by S. Tajima; T. Nakahashi; S. Uchida; S. Tanaka

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 539 KB
• Volume: 156
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(88)90110-4

✦ Synopsis

The plasma reflectivity spectra of YBa2Cu3Oy were measured for various oxygen content y. It was found that the plasma edge shifts towards lower energy with decreasing oxygen content y, hence with decreasing To. This result is discussed, together with the result on the Hall coefficient, based on the Mott-Hubbard and the Fermi liquid picture. It turns out that the latter is appropriate to explain the plasmon behavior in the oxide superconductors. Comparing the plasma frequencies mp of other oxide superconductors, we find the linear relation between co z and To, which cannot be explained by the BCS-theory.