Proximity Effects in Superconducting Wire Bonding

K. Tsukada, S. Yamasaki, N. Mizutani, G. Uehara, H. Kado, H. Akimoto, T. Ogashiwa

Research output: Contribution to journalComment/debatepeer-review

3 Citations (Scopus)


To investigate the superconducting characteristics of a superconducting wire bonding connection, a series of Nb electrodes consisting of an Au pad formed on a Si chip are made, and the pads are connected in series with a superconducting wire (Pb76in2oAu4). The I-V characteristics of the superconducting connection reflect the typical characteristics of an S-N-S sandwich structure, with normal resistance on the order of μω when a critical current(Ic) level is exceeded. The dependence of Ic on the thickness of Au is an exponential decrement, and Ic is over a hundred mA when Au thickness is between 20 nm and 230 nm. Auger analysis is applied to obtain the depth profile of the bonded part, revealing mutual Au and In atomic diffusion at the interface between the Au intermediate layer and the PblnAu wire.

Original languageEnglish
Pages (from-to)2965-2967
Number of pages3
JournalIEEE Transactions on Applied Superconductivity
Issue number1
Publication statusPublished - Mar 1993
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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