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 language | English (US) |
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Pages (from-to) | 85-87 |
Number of pages | 3 |
Journal | IEEE Transactions on Magnetics |
Volume | MAG-17 |
Issue number | 1 |
State | Published - Jan 1 1980 |
Event | Appl Superconduct Conf - Santa Fe, NM, USA Duration: Sep 29 1980 → Oct 2 1980 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering