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Ramp-edge Josephson junctions made of Pr2 xCexCuO4±δ electrodes and barriers
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Schematic cross-sectional view of the ramp with both PCCO x = 0.15 superconducting electrodes (gray) separated by a PCCO x = 0.05 barrier (black). The figure shows also the top amorphous (green) and the bottom substrate (striped brown). (b) AFM data of the ramp profile over a width of about 5.6 m. The dotted line shows the position of the interface between STO-A and the bottom PCCO electrode. From this data, we extract an average ramp angle of with respect to the surface of the substrate. (c) AFM data showing the rough STO-A layer on top of the PCCO bottom electrode prior to the deposition of the nonsuperconducting PCCO barrier and the top PCCO superconducting electrode film. One should note that the Z scale does not match those for X and Y.

Image of FIG. 2.
FIG. 2.

IV curves for junctions with superconducting electrodes with in subpanels (a) and (b), in subpanels (c) and in (d).

Image of FIG. 3.
FIG. 3.

Critical current as a function of applied magnetic field for PCCO x = 0.15 with a barrier of 22.5 nm of PCCO x = 0.05 at (a) 4.2 K and (b) 9 K. Solid lines are guides for the eye.

Image of FIG. 4.
FIG. 4.

(Color online) Shapiro steps observed in the IV curves measured on a 56 m wide PCCO junction at 4.2 K. (a) as a function of frequency (top panel: 10 GHz, middle: 15 GHz, bottom: 20.5 GHz); (b) as a function of RF power at 20.5 GHz: from top to bottom - 2 , 6, and 12 dbm.

Image of FIG. 5.
FIG. 5.

(Color online) Temperature dependence of the critical current density for a junction with electrodes at , a barrier thickness of 22 nm and width of 145 m. The solid (red) line is a fit to in the temperature range from 0.4 to .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ramp-edge Josephson junctions made of Pr2−xCexCuO4±δ electrodes and barriers