Intrinsic Josephson Junction Arrays on Bi2Sr2CaCu2O8+x Single Crystals and Their Possible Applications at 100 GHz

Huabing WANG  Jian CHEN  Kensuke NAKAJIMA  Tsutomu YAMASHITA  Peiheng WU  

IEICE TRANSACTIONS on Electronics   Vol.E84-C   No.1   pp.61-66
Publication Date: 2001/01/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Superconductive Electronics)
Category: Analog Applications
intrinsic Josephson effects,  microwave response,  frequency mixing,  high frequency application,  

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C-axis junction-arrays, with a-b plane sizes of sub-microns to 10 microns, were patterned on Bi2Sr2CaCu2O8+x single crystals with either a mesa or an overlap structure. We measured the current-voltage (I-V) characteristics with microwave irradiation at a few to 100 gigahertz. At a few gigahertz, often observed were chaotic properties. Under irradiation at 100 GHz, we successfully performed harmonic mixings between the 100 GHz signal and up to the 100th harmonic of a local oscillator at about 1 GHz. Given in this paper are discussions on the observation of individual Shapiro steps, and descriptions of the relevant results. Our experimental results show that intrinsic Josephson junctions in layered superconductors can be good candidates for high frequency applications.