The dependence ofTcon carrier concentration in high-Tcsuperconductors

✍ Scribed by S. Dzhumanov

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 119 KB
• Volume: 21
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1996.0401

✦ Synopsis

The dependence of T c on carrier concentration, n, and its variation in high T c and conventional superconductors is studied beyond the standard Fermi-liquid (i.e. BCS)-scenario within the novel two-stage Fermi-Bose-liquid (FBL) theory and two FBL scenarios in socalled fermion superconductors (FSC) and boson ones (BSC). It is shown that the initial increase of T c (n) and its subsequent saturation at any optimal n = n opt is controlled by the concentration dependence of the condensation temperature, T B , of an attracting Bose-gas of bipolarons, and then the decrease of T c (n) for higher n > n opt is determined by the concentration dependence of the depairing temperature of bound polaron pairs.