Theoretical analysis of heat conductivity in high-Tc oxides

✍ Scribed by R. Zeyher

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 145 KB
• Volume: 194-196
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)91300-5

✦ Synopsis

Using a screened ionic model for the electron-phonon interaction the temperature dependence of the lattice and electronic contributions to the heat conductivity and of the Wiedemann-Franz ratio is calculated. It is shown that the experimental data can reasonably well be explained in this model assuming a strong electron-phonon coupling. A similar good agreement can be achieved within a marginal Fermi liquid model, however, such an explanation would require an unreasonably small electron-phonon coupling.

The temperature dependence of the in-plane heat conductivity ~ab in YBa2Cu307[1] (as well as in other high-To oxides [2]) exhibits an interesting behavior: In the normal state it is rather flat, below T~ it first increases with decreasing temperature, then reaches a maximum near