Abstract
High-quality Bi 2Sr 2CaCu 2O 8+ δ (Bi-2212) single crystals were grown by a self-flux method without mixing and grinding of the reagent of starting powders, to simplify the growth process of the crystals. During the crystal growth process, a pressure (<0.4 N/cm 2) was applied using a brick placed on the cap on an alumina crucible. We obtained high-quality single crystals with zero-resistance transition temperature T c,zero≈90 K in the best sample. The Bi-2212 intrinsic Josephson junctions (IJJs) were fabricated using standard photolithographic and Ar-ion milling techniques. Multi-branch structures were clearly observed in the I– V curves of the Bi-2212 IJJs. The critical current of the junction was sensitive to external magnetic-fields parallel to the a– b plane at temperature up to 89 K.
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