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.
High-field superconductivity in alloyed MgB2 thin films / V., Braccini; A., Gurevich; Vaglio, Ruggero; M. C., Jewell; C. B., Eom; D. C., Larbalestier; A., Pogrebnyakov; Y., Cui; B. T., Liu; Y. F., Hu; J. M., Redwing; Qi, Li; X. X., Xi; R. K., Singh; R., Gandikota; J., Kim; B., Wilkens; N., Newman; J., Rowell; B., Moeckly; V., Ferrando; C., Tarantini; D., Marr; M., Putti; C., Ferdeghini; E., Haanappel. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 71:(2005), pp. 012504-1-012504-4. [10.1103/PhysRevB.71.012504]
High-field superconductivity in alloyed MgB2 thin films
VAGLIO, RUGGERO;
2005
Abstract
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.| File | Dimensione | Formato | |
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