Influence of Sr substitution on structure, hole concentration in CuO2 planes, and irreversibility line in (Hg,Pb) (Ba,Sr)(2)Ca2Cu3O8+delta single crystalsстатья
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Аннотация:Single crystals of HgBa2Ca2Cu3O8+delta 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 increases on Sr substitution. The thickness of the charge reservoir decreases with Sr substitution by 0.7 Angstrom.