JOSEPHSON EFFECTS IN Nb3Sn MICROBRIDGES.

Tsung Wen Lee, Charles M. Falco

Research output: Contribution to journalConference article

Abstract

Josephson effects in long narrow Nb//3Sn microbridges at temperatures up to 17 K were studied. These microbridges are formed by photolithographic techniques and subsequently subjected to controlled electrical discharges to modifY the intrinsic T//c of the bridge region. The bridges exhibit 10 GHz microwave steps in their I-V characteristics whose amplitudes are in agreement with the Resistively Shunted Junction (RSJ) model. I-V characteristics can be fit assuming an effective temperature approximately 15 K above the bath temperature. Structures in the I-V characteristics in the absence of microwaves were also investigated. It was demonstrated 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/T//c) one-half insteady of the usual mean field result (1-T/T//c)**3**/**2.

Original languageEnglish (US)
Pages (from-to)85-87
Number of pages3
JournalIEEE Transactions on Magnetics
VolumeMAG-17
Issue number1
StatePublished - Jan 1 1980
EventAppl Superconduct Conf - Santa Fe, NM, USA
Duration: Sep 29 1980Oct 2 1980

ASJC Scopus subject areas

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

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