Effect of synthesis process and substrate on electrical and thermal transport properties of Bi-2212

Resistivity, thermoelectric power, and thermal conductivity have been measu red for a Bi-2212 system synthesized from a glassy precursor, either with a commercially Al2O3 substrate or with a homemade BaZrO3 substrate. Those me asurements show that the BaZrO3 substrate gives better superconducting prop erties to the Bi-2212 than the Al2O3 substrate. The effect of (1.0 T) weak magnetic field has been searched for. The thermal magnetoconductivity and t he contributions of the magnetic field to the thermoelectrical power are st udied and compared through fine measurements. An electronic contribution se ems to appear already well above the critical temperature and to exist up t o 200 degrees K. The onset temperature is thus deduced.