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Imaging of vortex states in mesoscopic superconductors
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Microfabrication of submicron mesoscopic single crystal superconductors: high aspect ration FIB patterning (a) is followed by gold electroplating (b) with subsequent backside exposure (c) and cleaving (d). SEM micrographs show the single crystal surface after performing FIB patterning with periodic structure containing a square array of pillars (e) and the surface and cross-sectional structure after the final cleavage step (f). At the bottom of the FIB milled box one can see the electroplated gold that penetrates the interstitials of the single crystal.

Image of FIG. 2.
FIG. 2.

(Color online) STM topography of the single crystal surface with periodic array of elliptical gold pinning centers at 4.2 K (a). The apparent surface profile across the gold center (black line segment) shows variations that do not exceed 1 nm over (b). STM spectroscopy performed along the black segment line show superconducting tunneling conductance spectra on the surface area that gradually transforms into flat normal metal conductance spectra recorded in the center of the gold island (c).

Image of FIG. 3.
FIG. 3.

Images of vortex configurations in a square array of normal metal elliptical holes at zero applied magnetic field (a) and matching magnetic fields of (b) and (c) where is the matching field of the pattern equal to . The images were recorded using current image tunneling spectroscopy on an area of at 4.2 K.


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Scitation: Imaging of vortex states in mesoscopic superconductors