Abstract
A new kind of microscopy based on the Fraunhofer diffraction effect has been developed to determine the location of a single Abrikosov vortex that is trapped in a superconducting thin film, which in turn is one leg of a Josephson junction. With proper manipulation of currents, the vortex can be pushed to any desired location in the thin film. This microscopy has been used to measure the elementary pinning force on a single vortex in several different materials. Using these methods, it has been possible to follow a vortex as it begins to thermally depin and hops to different sites. Thermal depinning always seems to occur when the bulk superfluid density is about 4% of the zero temperature value.
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References
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© 1996 Springer-Verlag
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Finnemore, D.K. (1996). Superconducting fraunhofer microscopy the one vortex problem. In: Klamut, J., Veal, B.W., Dabrowski, B.M., Klamut, P.W. (eds) Recent Developments in High Temperature Superconductivity. Lecture Notes in Physics, vol 475. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0102035
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DOI: https://doi.org/10.1007/BFb0102035
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