GROWTH AND ANNEALING OF (BI1-XPBX)(2)SR2CACU2O8-CRYSTALS(DELTA SINGLE)

We report on the growth of (Bi1-xPbx)(2)Sr2CaCu2O8+delta single crysta ls. The crystals reach a maximum substitution level of x approximate t o 0.20 accompanied by a clear increase in the wavelength of the displa cive modulation along the b-axis, in agreement with the results of the polycrystalline samples. Their transition temperature can be varied f rom 90 K to 76 K by annealing in argon and oxygen respectively. We als o introduce various modifications to the annealing procedures in order to get very narrow transitions, as small as 0.3 K for the undoped cry stals.