Spectral range of the ac Josephson effect in (001)-tilt YBa2Cu3O7-x bicrystal junctions

Divin, Y.; Gubankov, V. N.; Volkov, O. Y.; Liatti, M.

doi:10.1109/TASC.2003.813994

Journal Article

PreJuSER-32123

Spectral range of the ac Josephson effect in (001)-tilt YBa2Cu3O7-x bicrystal junctions

Divin, Y.FZJ* ; Volkov, O. Y. ; Liatti, M. ; Gubankov, V. N.

2003
IEEE New York, NY

IEEE transactions on applied superconductivity 13, 676 - 679 (2003) [10.1109/TASC.2003.813994]

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Please use a persistent id in citations: http://hdl.handle.net/2128/1064 doi:10.1109/TASC.2003.813994

Abstract: We have studied the ac Josephson effect in YBa2Cu3O7-x bicrystal junction by monitoring the voltage dependence of the dc current response DeltaI(V) induced by low-power monochromatic radiation with the frequencies f(i). The intensity of odd-symmetric resonances in the function DeltaI(V) near the voltages V-i = hf(i)/2e is proportional to the amplitude of Josephson oscillations at the frequency f(i). The resonance intensities have been mapped as a function of the Josephson frequency f(i) in the range from 5 GHz to 5 THz, the junction resistance R-n in the range from 0.4 to 80 Ohm and junction characteristic voltages IcRn in the range from 5 muV to 1.8 mV. The central frequency of the range was scaled with the IcRn-product of the junction and it could be shifted from GHz-range to the THz-range by a temperature decrease. The spectral range was limited by an enhanced noise broadening of the Josephson linewidth at low frequencies and by increased dc Joule heating at high frequencies.

Keyword(s): J ; detectors (auto) ; high-temperature superconductors (auto) ; Josephson effect (auto) ; spectral analysis (auto)