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We investigated the effect of alloying on the upper critical field Hc2 for 12 MgB2 films, in which disorderwas introduced by growth, carbon doping or He-ion irradiation, finding a significant Hc2 enhancement inC-alloyed films, and an anomalous upward curvature of Hc2sTd. Record high values of Hc2's4.2d<35 T andHc2is4.2d<51 T were observed perpendicular and parallel to the ab plane, respectively. The temperaturedependence of Hc2sTd is described well by a theory of dirty two-gap superconductivity. Extrapolation of theexperimental data to T=0 suggests that Hc2is0d may approach the paramagnetic limit of ,70 T

physical review. b, condensed matter and materials physics

High-field superconductivity in alloyed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Mg</mml:mi><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>thin films

High-field superconductivity in alloyedMgB2thin films