Abstract
Under certain circumstances a superconducting ring containing a weak superconducting junction (a SQUID) has two metastable magnetic flux states separated by a potential barrier when an external magnetic field is applied of appropriate strength. If the junction has a small capacitance, even at low temperatures where kT is very much smaller than the barrier height ΔU intrinsic magnetic flux transitions are observed from one metastable flux state into an other and vice versa, or in other words a weak “persistent supercurrent” switches stochastically from one direction into the opposite. This flux transition mechanism at very low temperatures might be interpreted as due to macroscopic quantum tunnelling, a new macroscopic quantum effect.
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.
