Experimental observation of the longitudinal plasma excitation in intrinsic Josephson junctions

Details Experimental observation of the longitudinal plasma excitation in intrinsic Josephson junctions Experimental observation of the longitudinal plasma excitation in intrinsic Josephson junctions

2008-09-29

arxiv.org/abs/0809.4932v1

Physics

Condensed Matter

Superconductivity

7 pages, 7 figures. Dubna-Nano2008, Accepted for JPCS,

Scientific paper

10.1088/1742-6596/129/1/012029

We have investigated the current-voltage characteristics (IVCs) of intrinsic Josephson junctions (IJJs). Recently, it is predicted that the longitudinal plasma wave can be excited by the parametric resonance in IJJs. Such an excitation induces a singularity called as breakpoint region around switch back region in the IVC. We have succeeded in the observation of the breakpoint region in the IVC of the mesa with 5 IJJs at 4.2 K. Furthermore, it is found that the temperature dependence of the breakpoint current is in agreement with the theoretical prediction. This suggests that the wave number of the excited plasma wave varies with temperature.

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