Abstract
We have studied the tunneling characteristics of planar junctions made on YBCO single crystals with T c=90 K and T c=60 K. Natural barriers of good quality have been obtained on both compounds. In comparison with the 90 K phase, the superconducting conductance curves of the 60 K phase show gap-like structures reduced in amplitude and shifted towards higher energies. For the higher T c material, a gap opening, at about 90 K, is observed. Normal state conductances, measured at T> T c, are highly linear in voltage on both compounds and have steeper slopes on the 60 K phase. The slopes are quite insensitive to temperature variations, and do not depend on the junction resistances nor on the materials used as counterelectrodes.
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