,Anisotropy of the upper critical field in c-axis oriented MgB2 thin films

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C-axis oriented MgB2 thin films were synthesized on single-crystal MgO (111) substrates using a chemical vapour deposition technique. The as-formed films revealed a sharp superconducting transition temperature of 38K with the transition width 0.2K. The temperature dependence of the upper critical magnetic field Hc2 (T) in the films was determined via resistivity for magnetic field H parallel and perpendicular to the c axis of the films. Using the Werthamer-HelfandHohenberg formula, we obtained the anisotropy ratio of the upper critical field γ=1.2.
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