Abstract

We have synthesized the single phase samples of CuxC0.1Ba2Ca3Cu4Oz(x=0.2∼0.9). Transport and magnetic measurements and iodometric titration analysis were carried out for these materials. From these results we discuss the correlation between Tc, the Hall number, copper valence and oxygen content. The effect of the substituted M ions on Tcin (CuC, M)-l234 (M=Ni,Zn,Al,TI,Mg) is also discussed. We propose a unique selective carrier-doping mechanism in (Cu,C)- and (CuC,Mg)-1234 systems.

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