Abstract
We have investigation the effect of Gd, Fe, Zn and Al substitutions on the tunneling characteristics of planar tunnel junctions realized on single crystals of YBaCuO with different concentration doping. No relevant differences have been found in the conductance characteristics vs voltage of undoped 90 K and Gd junctions, so conforming that substitution of Y by other rare-earth does not affect the material superconducting properties. A different behavior has been found for substitutions on the Cu sites. Fe, Zn and Al doped junctions show broadened gap-like structures at about ±25 mV and dissapearance of the structures at ±5 mV, observed for the 90 K YBaCuO phase.
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