Josephson effects in Nb3Sn microbridges

T. W. Lee, Charles M. Falco

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We have studied Josephson effects in long narrow Nb3Sn microbridges at temperatures up to 17 K. These microbridges are formed by photolithographic techniques and subsequently subjected to controlled electrical discharges to modify the intrinsic Tc of the bridge region. The bridges exhibit 10 GHz microwave steps in their I-V characteristics whose amplitudes are in excellent agreement with the Resistively Shunted Junction (RSJ) model. I-V characteristics (with and without microwaves) can be fit assuming an effective temperature approximately 15 K above the bath temperature. We have also investigated in detail structures in the I-V characteristics in the absence of microwaves. We show experimentally that phase-slip centers are induced at weak superconducting positions along the bridge when the S-N boundary of an expanding hot spot reaches within a thermal healing distance. The critical current of the phase-slip center thus formed exhibits a temperature dependence (1-T/TC)1/2 instead of the usual mean field result (1-T/TC)3/2.

Original languageEnglish (US)
Pages (from-to)85-87
Number of pages3
JournalIEEE Transactions on Magnetics
Volume17
Issue number1
DOIs
StatePublished - Jan 1981

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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