Tunneling spectroscopy into substituted YBaCuO systems

https://doi.org/10.1016/0921-4526(94)91371-4Get rights and content

Abstract

We have studied the tunneling characteristics of Gd and Al substituted YBa2Cu3O7−δ single crystals with Tc = 90 K and 80 K respectively. The high-Tc superconductos were etched 30 min in a 1% Br solution in methanol and the tunnel barriers were formed by exposing the crystals to the ambient atmosphere for about 30 min. Pb film counterelectrodes were thermally evaporated through a metallic mask. No relevant differences have been found in the differential resistance vs voltage of undoped 90 K and Gd junctions, so confirming that Gd is substituting for Y. A different behavior has been found in the Al doped junctions that show smeared structures of reduced amplitude.

References (7)

  • P.H. Hor et al.

    Phys. Rev. Lett.

    (1987)
  • Y. Le Page et al.

    Phys. Rev. B

    (1987)
  • T. Siegrest et al.

    Phys. Rev. B

    (1987)
There are more references available in the full text version of this article.

Cited by (1)

  • Influence of Gd, Fe, Zn, and Al substitutions on the tunneling characteristics of the YBaCuO system.

    1994, Solid State Communications
View full text
Copyright © 1994 Published by Elsevier B.V.