Title

Planar Tunnel Junctions on 90 K and 60 K YBCO Single Crystals. Superconducting and Normal State Properties

Document Type

Article

Publication Date

8-15-1991

Abstract

We have studied the tunneling characteristics of planar junctions made on YBCO single crystals with Tc=90 K and Tc=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 Tc material, a gap opening, at about 90 K, is observed. Normal state conductances, measured at T>Tc, 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.

DOI

10.1016/0921-4534(91)90012-N

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