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Local thermal bistability in microwave coplanar resonators: Opposite jumpwise response to weak-link switching and to vortex avalanches
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View: Figures


Image of FIG. 1.
FIG. 1.

Resonance curves (scattering parameter, , vs frequency) for R1 after the application of a dc magnetic field of 13.35 Oe (a). The other frames report the response as a function of the input power of resonators R1 (b), R2 (c), and R3 (d) in zero dc field.

Image of FIG. 2.
FIG. 2.

Maximum value of as a function of the power delivered to the resonator R3, covered by a Au layer. The inset shows the bistable signal detected for a frequency sweep in the region of the jump .

Image of FIG. 3.
FIG. 3.

Frame (a) shows the comparison between the experimental resonance for R3 at an input power (circles) and the curve reconstructed by means of a piecewise-defined Lorentzian function (line). The experimental curve for is reported as a reference (dashed line). The corresponding dissipation term, , is shown in (c). Numbers help in the correlation between features in the two plots. The same analysis is reported in frames (b) and (d) for R1 at and , after the increase in the external dc magnetic field from 18.25 to 18.70 Oe.

Image of FIG. 4.
FIG. 4.

Sketch of the resonator near the edge, after a VA occurrence and after switching of a WL. The graph qualitatively reports the transverse distribution of rf currents for the coplanar layout (sharp peaks at the edges corresponding to the shadowed region in the drawing).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Local thermal bistability in MgB2 microwave coplanar resonators: Opposite jumpwise response to weak-link switching and to vortex avalanches