Observation of the AC Josephson effect up to THZ frequencies in YBCO/PBCO/YBCO ramp-type Josephson junctions

Terpstra, D. and Rijnders, A.J.H.M. and Roesthuis, F.J.G. and Blank, D.H.A. and Gerritsma, G.J. and Rogalla, H. (1993) Observation of the AC Josephson effect up to THZ frequencies in YBCO/PBCO/YBCO ramp-type Josephson junctions. Physica C: Superconductivity, 217 (1-2). pp. 151-155. ISSN 0921-4534

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Abstract:	We present the response to 100 GHz irradiation of high-Tc Josephson junction devices for mixer/detector applications in the (sub-) mm wave range. These devices consist of a YBCO/PBCO/YBCO ramp-type junction combined with a planar logarithmic periodic antenna. The critical current and the first two Shapiro steps modulate with 100 GHz power according to the resistively shunted junction (RSJ) model. At 10 K clear Shapiro steps have been observed up to a voltage of about 7.5 mV. This corresponds to phase locking of 3.6 THz AC Josephson oscillations by the 36th harmonic of the 100 GHz signal. The number of observed steps is currently limited by the available power, but they are present up to voltages strongly exceeding the IcRn product of the junction at all temperatures.
Item Type:	Article
Copyright:	© 1993 Elsevier Science B.V.
Faculty:	Science and Technology (TNW)
Research Group:	Inorganic Materials Science (IMS) Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/23759
Official URL:	http://dx.doi.org/10.1016/0921-4534(93)90805-Z
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