Abstract
Annealing experiments in an environment of 1 bar oxygen have been performed on large single crystals of Bi 2Sr 2CaCu 2O 8 + δ which are grown with a travelling solvent floating zone technique. The superconducting onset temperature T c and the width of the X ac transition ΔT c, both indications for the distribution of the excess oxygen concentration δ, have been determined as a function of the annealing temperature T ann. T c increases approximately linearly with T ann and has been tuned between 80 and 94 K. After annealing, very narrow transitions (0.5 < ΔT c < 1.5 K) are obtained, indicating the homogeneity of the crystals with regard to the oxygen concentration.
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