Flat and Lateral High-T_c Superconducting Junctions Applied to Millimeter-Wave Mixer (Special Issue on Toward Digital and Analog Applications of Superconductors)

概要

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Here we report on a fabrication and a millimeter-wave performance of reliable and reproducible high-T_c superconducting (HTS) Josephson junctions on MgO substrates using a focused Ga ion beam (FIB). The junction normal resistance R_n can be controlled by making the junction in a series. The R_n depends on space between each junction in the series structure. A mechanism of the junction is proposed by measuring cross-sectional transmission electron microscopy (TEM) images and their X-ray spectra of Ga, Y, Ba, Cu, Mg and O. The junctions with more than lμ spaces, and flat and lateral structure are independent each other for the crystallization process. We observe the HTS mixer-antenna performance as fundamental/harmonic mixers in the wide frequency range up to 100 GHz.
社団法人電子情報通信学会の論文
1996-09-25