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arXiv cond-mat/0402001cond-mat.supr-con
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合金化MgB2薄膜的高场超导电性

High-field superconductivity in alloyed MgB2 thin films

V. Braccini, A. Gurevich, J. E. Giencke, 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. … 展开作者

V. Braccini, A. Gurevich, J. E. Giencke, 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. Marre, M. Putti, C. Ferdeghini, R. Vaglio, E. Haanappel

摘要:

我们研究了12个$MgB_2$薄膜中合金化对上临界场$H_{c2}$的影响,在这些薄膜中,通过生长、碳掺杂或He离子辐照引入了无序,发现C合金化薄膜中$H_{c2}$显著增强,并且$H_{c2}(T)$异常向上弯曲。分别在垂直和平行于ab平面的方向观察到创纪录的高值$H_{c2}^{\perp}(4.2) \simeq 35T$和$H_{c2}\|(4.2) \simeq 51T$。$H_{c2}(T)$的温度依赖性可以用脏双能隙超导理论很好地描述。将实验数据外推至T = 0表明,$H_{c2}\|(0)$接近$\sim 70T$的顺磁极限。

英文摘要:

We investigated the effect of alloying on the upper critical field $H_{c2}$ in 12 $MgB_2$ films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, finding a significant $H_{c2}$ enhancement in C-alloyed films, and an anomalous upward curvature of $H_{c2}(T)$. Record high values of $H_{c2}^{\perp}(4.2) \simeq 35T$ and $H_{c2}\|(4.2) \simeq 51T$ were observed perpendicular and parallel to the ab plane, respectively. The temperature dependence of $H_{c2}(T)$ is described well by a theory of dirty two-gap superconductivity. Extrapolation of the experimental data to T=0 suggests that $H_{c2}\|(0)$ approaches the paramagnetic limit of $\sim 70T$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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