Abstract
We have investigated the strength of the ac Josephson effect, I MAX 1/I C, above the gap voltage V g in Nb point contacts. We found that its dependence on voltage is empirically formulated as I MAX 1/I C = exp{- α( V- β)}, where the damping constant α has a strong correlation with the magnitude of V g. From the existence of the threshold at ≈V g in the damping of I MAX 1/I C, we conclude that the exponential damping of the strength of the ac Josephson effect above the gap voltage is caused by the injection of quasiparticles. By finding of the correlation between the gap voltage and the cooling efficiency of the point contact, we confirm that the damping constant α is determined by the cooling efficiency of the point contact.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physica B+C
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
