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Solid State Communications

Observation of a microwave induced resistive state in a long Josephson tunnel junction

T.V. Rajeevakumar, John X. Przybysz, J. T. Chen

Published Mar 1, 1978• 7 citations
Publisher
DOI
10.1016/0038-1098(78)90235-1

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Incoherent microwave-induced resistive states of small Josephson junctions

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We report an experimental and theoretical study of low-voltage resistive states observed in small tunnel Josephson junctions subject to microwave radiation. The observed features result from Shapiro steps in the current–voltage characteristics and appear when both thermal fluctuations and high frequency dissipation are strong. Without microwave radiation, Josephson junctions have a phase diffusion supercurrent branch characterized by a finite small resistance and hysteretic switching to a higher voltage range under these conditions. When microwave radiation is applied, three different types of resistive states are observed in the current-voltage characteristics. First, a phase diffusion branch steadily evolves and its maximum voltage Vm increases with the microwave power. Another interesting observed feature is a zero-crossing resistive state characterized by a negative resistance. Finally, we find that the low-voltage resistive state can split into numerous hysteretic fine branches resembling incoherent Shapiro-like steps. The appearance of a particular resistive state depends on the interrelations among the Josephson energy EJ, the energy kBT of thermal fluctuations, and the microwave frequency ω. A theoretical analysis based on incoherent multi-photon absorption by a junction biased in the Josephson phase diffusion regime is in good agreement with the experimental observations.

Low Temperature Physics•Oct 1, 2010•2 citations
We have fabricated an artificial BaPb1- x Bi x O3 grain boundary tunnel junction on a SrTiO3 bicrystal substrate. Current-voltage characteristics exhibit supercurrent and quasi-particle tunneling which is commonly observed for superconductor-insulator-superconductor (SIS) type junctions. A Shapiro step is observed for a junction with a large area under microwave radiation. On the other hand, microwave-induced dc voltages at zero bias current are observed for a narrow junction. This dependence on the junction width indicates that generation of the microwave-induced voltages is related to normal resistance or capacitance of a junction.
We report an experimental and theoretical study of low-voltage resistive states observed in small tunnel Josephson junctions subject to microwave radiation. The observed features result from Shapiro steps in the current–voltage characteristics and appear when both thermal fluctuations and high frequency dissipation are strong. Without microwave radiation, Josephson junctions have a phase diffusion supercurrent branch characterized by a finite small resistance and hysteretic switching to a higher voltage range under these conditions. When microwave radiation is applied, three different types of resistive states are observed in the current-voltage characteristics. First, a phase diffusion branch steadily evolves and its maximum voltage Vm increases with the microwave power. Another interesting observed feature is a zero-crossing resistive state characterized by a negative resistance. Finally, we find that the low-voltage resistive state can split into numerous hysteretic fine branches resembling incoherent Shapiro-like steps. The appearance of a particular resistive state depends on the interrelations among the Josephson energy EJ, the energy kBT of thermal fluctuations, and the microwave frequency ω. A theoretical analysis based on incoherent multi-photon absorption by a junction biased in the Josephson phase diffusion regime is in good agreement with the experimental observations.