Abstract
We have investigated the subgap tunneling characteristics in single crystals of Bi2Sr2CaCu2O8+δ and thin films of Tl2Ba2Ca2Cu3O10+δ with intrinsic Josephson junctions in the resistive state. The low temperature current voltage characteristics (IVC) exhibits a high subgap conductivity. The results are compared to a calculated IVC for tunnel junctions between two identical d-wave superconductors. The calculated quasiparticle branch agrees reasonable with the measured IVC. However, the presence of a small s-wave component can not be excluded. Besides the global IVC we studied fine structures which were observed in the IVC of both materials. These structures can be explained by a resonant coupling of infrared active c-axis phonons to the Josephson ac currents between adjacent pairs of superconducting layers.
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