Effects of redox thermal treatments on the transverse resistance peak at the edge of the superconducting transition in Bi2Sr2CaCu2O8+x

✍ Scribed by G. Balestrino; E. Milani; A.A. Varlamov

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 368 KB
• Volume: 210
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)90981-u

✦ Synopsis

The growth of the transverse resistivity just above the transition in BizSr2CaCuzQ ** ( BSCCO 2212 ) expitaxial films is studied in the framework of the recent fluctuation model proposed by Ioffe, Larkin, Varlamov and Yu Lu. The effects of different redox thermal treatments on the transverse resistive peak is investigated. The fit of the experimental curves with the theo~ is good and allows one to estimate the values of some physical parameters included in the theory itself (namely the in-plane Fermi velocity t'v, the carrier lifetime ~ and the hopping integral w). It is shown that the oxidizing thermal treatment gives rise to a strong decrease in the transverse resistance peak just above To. Such effect is ascribed to the increase in t'F due to the growth of the carrier concentration induced by the oxidizing treatment. Effects on the carrier lifetime and the hopping integral are hindered by the large variation of vv.