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Aspects of proximity effect in tunneling and point-contact spectroscopies of high-critical-temperature superconductors

In this paper the possibility that high critical temperature superconductor (HCTS) electrodes are non homogeneous is considered. The effect of such a configuration on current vs. voltage characteristics in HCTS junctions is analyzed and modelled in significative limits. Typical features, such as the depression of gap structures and finite zero bias conductances, are explained according to the proposed model. This last is based on arguments of proximity effect between weakly coupled bilayers (superconductor--normal metal). It allows to study tunnel and point contact (PCJ) junctions, providing results qualitatively different from classical theories on PCJ. The low transmissive nature of such an interface seems to play a fundamental role in determining current vs. voltage characteristics in HCTS junctions. The results of the presented model suggest also PCJ as a sensitive tool to evaluate the transmission probability of interfaces between a superconductor and a metal.