Magnetic flux locking in two weakly coupled superconducting rings
作者:
R. de Bruyn Ouboter,
A. N. Omelyanchuk,
E. D. Vol,
期刊:
Low Temperature Physics
(AIP Available online 1998)
卷期:
Volume 24,
issue 10
页码: 767-769
ISSN:1063-777X
年代: 1998
DOI:10.1063/1.593669
出版商: AIP
数据来源: AIP
摘要:
We have analyzed the quantum interference effects in the macroscopic “superconducting molecule.” The composite system consists of two massive superconducting rings, each interrupted by a Josephson junction, which are at the same time weakly coupled with one another. The special case of coupling via the Josephson four-terminal junction is considered. The structure of the macroscopic quantum states in an applied magnetic field is calculated. It is shown that, depending on the values of the magnetic fluxes through each ring, the system displays two groups of states, the “orthostates” with both induced currents going in the same direction, and the “parastates” with the opposite currents and with the total induced flux locked to zero value. The transition to the flux locked state with changing of the total applied flux is sudden and is preserved in a certain interval which is determined by the difference of the fluxes applied through each ring. It makes the system sensitive to small gradients of the external magnetic field. ©1998 American Institute of Physics.
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