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Pramana

, Volume 33, Issue 2, pp L333–L338 | Cite as

Effect of heat treatment on Ag/Y-Ba-Cu-O contact resistance

  • Neeraj Khare
  • S K Arora
  • G S N Reddy
  • V S Tomar
  • V N Ojha
  • N D Kataria
  • A K Gupta
Rapid Communication

Abstract

The contact resistance (R c) of the metal/YBCO interface has been studied in pressed indium, painted colloidal silver and thermally-evaporated silver contact pads. Indium contacts always show the highest resistance amongst these three systems. In thermally-evaporated Ag contacts, post-deposition thermal treatments show favourable effects on the reduction ofR c. Heat treatment in oxygen atmosphere in two steps is essential to reduce theR c values. Significant improvement in obtaining low resistivity contacts has been attributed to the diffusion of silver atoms to grain boundaries at the surface of YBCO and to the enrichment of oxygen-deficient layer at the interface during thermal treatment.

Keywords

High temperature superconductivity Y-Ba-Cu-O contact resistance metal-superconductor interface 

PACS No.

74.50 

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Copyright information

© Indian Academy of Sciences 1989

Authors and Affiliations

  • Neeraj Khare
    • 1
  • S K Arora
    • 1
  • G S N Reddy
    • 1
  • V S Tomar
    • 1
  • V N Ojha
    • 1
  • N D Kataria
    • 1
  • A K Gupta
    • 1
  1. 1.National Physical LaboratoryNew DelhiIndia

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