High-field superconductivity in alloyed MgB2 thin films
- BRACCINI V.
- GUREVICH A.
- GIENCKE J.E.
- JEWELL M.C.
- EOM C.B.
- LARBALESTIER D.C.
- POGREBNYAKOV A.
- CUI Y.
- LIU B.T.
- HU B.T.
- REDWING J.M.
- QI LI
- XI X.X.
- SINGH R.K.
- GANDIKOTA R.
- KIM J.
- WILKENS B.
- NEWMAN N.
- ROWELL J.
- MOECKLY B.
- FERRANDO V.
- TARANTINI C.
- MARRE' D.
- PUTTI M.
- FERDEGHINI C.
- VAGLIO R.
- HAANAPPEL E.
DOIAbstract
We investigated the effect of alloying on the upper critical field Hc2 for 12 MgB2 films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, finding a significant Hc2 enhancement in C-alloyed films, and an anomalous upward curvature of Hc2sTd. Record high values of Hc2 's4.2d<35 T and Hc2 is4.2d<51 T were observed perpendicular and parallel to the ab plane, respectively. The temperature dependence of Hc2sTd is described well by a theory of dirty two-gap superconductivity. Extrapolation of the experimental data to T=0 suggests that Hc2 is0d may approach the paramagnetic limit of ,70 T
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