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- W2107301918 abstract "We report transport properties of superconducting MgB/sub 2/ thin films in-situ grown by molecular beam epitaxy. The MgB/sub 2/ films show a superconducting transition at 34.5 K with /spl Delta/T/sub c/<1 K. We measure the in-plane electrical resistivity of the films in magnetic field to 8 T and estimate the upper critical field H/sub c2//sup /spl perp//(0)/spl sim/32 T for field oriented along the c-axis and H/sub c2//sup /spl par//(0)/spl sim/35 T in the plane of the film. We find the zero-temperature coherence lengths /spl xi//sub c/(0)/spl sim/31 /spl Aring/ and /spl xi//sub ab/(0)/spl sim/36 /spl Aring/, indicating the field anisotropy ratio is 1.2, comparable with reported in-situ epitaxial thin films, but less than single crystals. The calculated electronic mean free path l=25 /spl Aring/ is smaller than the coherence length, which places our films in the dirty limit. Estimates of the critical current density, J/sub c/, using magnetic field hysteresis loops and the Bean critical state model give nominal critical current densities on the order of 10/sup 6/ A/cm/sup 2/ at 15 K and self-field." @default.
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- W2107301918 date "2003-06-01" @default.
- W2107301918 modified "2023-10-16" @default.
- W2107301918 title "Anisotropy and critical current density of MgB/sub 2/ thin films grown in-situ by molecular beam epitaxy" @default.
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- W2107301918 doi "https://doi.org/10.1109/tasc.2003.812216" @default.
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