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VOLUME 60 (1994) | ISSUE 3 | PAGE 188
Effect of yttrium on the increase in Tc of Bi(2212) crystals
The incorporation of an yttrium dopant in Bi2Sr2CaCu208 + ^ single crystals raises Tc from 86 К all the way to 95 К at χ^0,1-0.15. Chemical analysis shows that yttrium replaces Ca atoms in the lattice. The increase in Tc is attributed to a binding of excess holes in Cu02 planes by the yttrium. This binding leads to an optimization of the carrier density. © 1994 American Institute of Physics.