Abstract
We measure the in-plane electrical resistivity of epitaxial MgB 2 thin films in magnetic fields to 60 T and estimate the superconducting upper critical field H p c(0)≈24±3 T for field oriented along the c-axis, and H ρ ab(0)≈30±2 T in the plane of the film. We find the zero-temperature coherence lengths ξ c(0)≈30 A ̊ and ξ ab(0)≈37 A ̊ to be shorter than the calculated electronic mean free path l≈100±50 A ̊ , which places our films in the clean limit. These large upper critical fields make MgB 2 a strong candidate for technological applications.
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