Abstract
We have performed atomic-scale high-resolution scanning tunnelling microscopyand spectroscopy measurements on the cleaved surface of single crystalBi2Sr2CaCuO8+δ superconductors with high critical current densityJc. The samples exhibited rugged structure about 15 nm in period, larger thanthe modulation of the BiO layer, which corresponded well to the energy gapdistribution at 77 K. The presence of inhomogeneity from a nanometre to amicrometre scale, in the energy gap distribution, the structural modulation andthe chemical composition fluctuation, may play an important role in improvingJc valuesin the Bi2Sr2CaCuO8+δ crystals.
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