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Physica C Superconductivity

Self-radiation power and microwave coupling of YBCO Josephson junction arrays on bicrystal MgO substrates

Insang Song, Ilho Lee, Kwang‐Yong Kang, Ihun Song, Sangmin Lee, Yunsung Huh, Gwangseo Park

Published Mar 1, 1998• 1 citation
Publisher
DOI
10.1016/s0921-4534(97)01860-1

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Frequency-locked and microwave-coupled arrays of high- superconducting Josephson junctions have been developed. The Josephson junctions were prepared on bicrystal MgO substrates using a pulsed laser ablation method. The maximum detected power of Josephson self-radiation, which is directly detected by a superheterodyne receiver with a central frequency of 22 GHz, from the arrays was enhanced with increasing number of Josephson junctions. The Josephson self-radiation properties of the arrays revealed a good quality of frequency locking and exactly satisfied the Josephson voltage-frequency relationship. A narrower linewidth of the Josephson self-radiation was obtained by increasing the number of Josephson junctions in the array.