THERMOPOWER IN BI2SR2CA(CU1-XFEX)(2)O-Y (X=0-0.1) WITH VARIOUS OXYGEN-CONTENT

Systematic study of the normal-state thermopower, S, for Bi2Sr2Ca(Cu1- xFex)(2)O-y ceramic samples has been carried out. The doping by Fe lea ds to a decrease of the critical temperature and an increase of the th ermopower value for both investigated series (as-sintered and oxygen-r educed samples) while these effects are stronger in the second case. F or a low doping level, the thermopower shows a linear temperature depe ndence that is typical for Bi-based HTSC. As doping level increases, t he S(T) dependence becomes weaker and has a well-pronounced maximum ar ound T=150-200 K like non-stoichiometric Y-123. The results are discus sed within a band spectrum model.