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Schematics of a superconducting device consisting of a laser inhibited YBCO bridge with a single -wide, LW channel oriented perpendicular to the direction of the bridge axis.
(a) MO image of the remnant magnetic field in a square contact pad of the bridge structure obtained after cooling the sample in 600 G and turning off the magnetic field at . (b) MO image of the penetration of 280 G magnetic field into the bridge area containing one LW channel. Bright areas in (a) and (b) correspond to higher intensity of a local magnetic field.
Resistivity vs temperature dependences of a -wide and -long YBCO bridge with a single -wide LW channel (2 - stars) and with two LW channels separated by (3 - diamonds), measured with a dc current of . Curve (1 - triangles) was recorded for a channel-free reference device. The inset shows evolution of the resistive tail with changing dc current for a single-channel device.
Temperature dependence of the critical current density for a reference bridge (1 - triangles) and a bridge containing a single LW channel (2 - stars).
curves of a single-channel bridge at and 87.83 K in zero applied field. The arrows mark an onset of the Josephson-like step structures. Inset: low voltage part of the curves on the expanded scale.
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