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Single crystals of HgBa2Ca2Cu3O8+δ compound with partial substitution of Sr and Pb have been grown at high gas pressure. Bond valence sum calculations show that the substitution of Sr for Ba leads to a more homogeneous distribution of holes between nonequivalent CuO2 planes. In nonsubstituted crystals, the density of holes is significantly higher in the inner CuO2 planes. The irreversibility field...
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