Synthesis of Pb, Fe and Cd doped Hg-based HgBa 2 Ca 2 Cu 3 O 8+δ (Hg-1223) superconducting ceramics was performed. Hg-free precursor Ba 2 Ca 2 Cu 3 O 8+δ with high chemical homogeneity and reactivity obtained by the sol-gel method was used. The superconducting and impurity phases were determined by means of scanning electron microscopy and microprobe analysis. The results of resistivity and magnetization measurements for different kinds of doped elements were presented.
Temperature dependences of thermoelectric power S(T) at T > Tc of the Hg-based high temperature superconductors Hg 1−x RxBa 2 Ca 2 Cu 3 O 8+δ (R=Re, Pb) have been analyzed with accounting for strong scattering of charge carriers. Transformation of parameters of a narrow conducting band in the region of the Fermi level was studied. The existence of correlation between the effective bandwidth and the temperature of a superconductive transition Tc is shown.
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