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.; B. T., Hu; Redwing, J. M.; Qi, Li; X. X., Xi; Singh, R. K.; Gandikota, R.; Kim, J.; Wilkens, B.; Newman, N.; Rowell, J.; Moeckly, B.; Ferrando, V.; Tarantini, C.; Marre', Daniele; Putti, Marina; Ferdeghini, C.; Vaglio, R.; Haanappel, E.

doi:10.1103/PhysRevB.71.012504

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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Titolo:	High-field superconductivity in alloyed MgB2 thin films
Autori:	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', DANIELE PUTTI, MARINA FERDEGHINI C. VAGLIO R. HAANAPPEL E. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2005
Rivista:	PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
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.
Handle:	http://hdl.handle.net/11567/247077
Appare nelle tipologie:	01.01 - Articolo su rivista

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