Mutual phase locking in Josephson junction arrays

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6825693

Jain, A K

Arrays of interacting Josephson junctions have been studied experimentally. The Josephson element in these arrays consisted of indium microbridges having sub-micron dimensions. An external resistive inductor connected across the array provided long range interaction between the junctions. The results of these experiments have been analyzed in light of the theory developed recently for such systems by Likharev, Kuzmin and Ovsyannikov. Detailed experimental results on the simplest such array of two junctions are presented. The interaction leads to frequency pulling and then to phase locking (and voltage locking) as the unperturbed frequencies of the two jucntions are brought closer. The effects of the interaction on the current voltage characteristic of the junctions and the behavior of the radiation linewidth and power in the neighborhood of voltage locking have been studied. These experiments clearly show the differing effects of the junction and coupling loop resistance noise on the locking stability and radiation linewidth for the series and parallel biasing configurations. All these observations are in accordance with the calculations of Likharev, et al. In addition, measurements have also been made on two microbridge arrays coupled by a superconducting loop. In this case, the phase difference between the junction oscillations was dependent on the flux through the loop, and both the radiated power and the linewidth varied periodically with this flux. An additional normal shunt was found to considerably decrease the variation of the phase difference with the flux. Larger linear arrays containing up to 99 junctions have also been studied.

• Research Organization: State Univ. of New York, Stony Brook (USA)
• OSTI ID: 6825693
• Country of Publication: United States
• Language: English

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Magnetic
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& Thermal Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BEAM DYNAMICS
COUPLING
CURRENTS
DATA
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELEMENTS
EXPERIMENTAL DATA
INDIUM
INFORMATION
JOSEPHSON JUNCTIONS
JUNCTIONS
METALS
MODE LOCKING
NOISE
NUMERICAL DATA
OSCILLATIONS
PHASE OSCILLATIONS
POWER
STABILITY
SUPERCONDUCTING JUNCTIONS