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Search name	Searched On	Run search
Author: Rangel-Mondragon, J (1)	28 Mar 2025	Run
Author: de Bruyn Ouboter, R (1)	28 Mar 2025	Run
Author: Brainerd, Tereasa G (1)	28 Mar 2025	Run
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Author: Vakarelov, Iliya Iv (1)	28 Mar 2025	Run

chapterNo Access
Metabistability in a SQUID and Macroscopic Quantum Tunnelling
- R. DE BRUYN OUBOTER
Foundations of Quantum Mechanics in the Light of New Technology01 Jan 1997
Preview Abstract
Under certain circumstances a superconducting ring containing a weak superconducting junction (a so called Superconduding Quantum Interference Device, 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, 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 another 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.^1,2)

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