Correlated pair transfer mechanism: Lochon-induced pairing in high-Tc superconductors

✍ Scribed by K.P. Sinha

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 221 KB
• Volume: 163
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(90)90302-b

✦ Synopsis

A correlated pair transfer mechanism involving electron pairs in the singlet state of the species X T+ (-Cu ', O~ , O-" , Bi 3~, TI+, etc.) and their virtual excited state X ° (= Cu :~+, O~ .... ) will be presented. The two states of the species (complex) arise from the transfer of local charged bosons (lochons) comprising electron pairs in the singlet state. These entities interact with the carriers (electrons or holes) in the high temperature materials giving rise to pairing interaction. As the mechanism is attractive for the entire conduction band, the superconducting critical temperature can be high. The induced pairing is of anisotropic singlet (s-wave) type owing to quasi two-dimensional character of conducting sheets.