Abstract
We report on thec-axis superconducting energy gap parameter Δ c (T) of intrinsic Josephson tunnel junctions inBi 2 Sr 2 CaCu 2 O 8+δ (Bi2212) single crystals. Δ c (4.2K)≈10−13 meV, which is approximately a factor of two smaller than reported in the majority of tunneling experiments. Δ c (T) deviates strongly from the BCS temperature dependence. These observations may be explained by a multilayer model of Bi2212 which assumes that theBi−O layers are superconducting due to the proximity effects. The Josephson tunneling then takes place between adjacentBi−O layers while there is a strong proximity coupling betweenBi−O andCu−O layers.
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