Abstract
We have grown high-quality Bi 2Sr 2CaCu 2O 8+ δ (Bi-2212) single crystals by a self-flux method without mixing and grinding of reagent-grade Bi 2O 2, SrCO 3, CaCO 3, CuO powders, to simplify the growth process of the Bi-2212 single crystals. During the crystal growth process, the pressure was applied using a brick placed on the cap on an alumina crucible. Under a 0.234 N/cm 2 pressure, we obtained high-quality single crystals with the zero superconducting transition temperature T c,zero=87.6 K in the best sample. The T c,zero values of the Bi-2212 single crystals were greatly affected by the pressure applied to the cap. The observed T c,zero vs. pressure curve was very similar to the T c vs. δ curve for Bi-2212 single crystals. The result indicates that the applied pressure to the cap may control the oxygen content in the Bi-2212 crystals.
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