EFFECT OF YTTRIUM ON THE INCREASE IN T(C) OF BI(2212) CRYSTALS

The incorporation of an yttrium dopant in Bi2Sr2CaCu2O8+delta single c rystals raises T(c) from 86 K all the way to 95 K at x almost-equal-to 0.1-0.15. Chemical analysis shows that yttrium replaces Ca atoms in t he lattice. The increase in T(c) is attributed to a binding of excess holes in CuO2 planes by the yttrium. This binding leads to an optimiza tion of the carrier density. (C) 1994 American Institute of Physics.