High-field superconductivity in alloyed Mg B 2 thin films
By V. Braccini, A. Gurevich, J. Giencke, M. Jewell, C. Eom, D. Larbalestier, A. Pogrebnyakov, Y. Cui, B. Liu, Y. Hu and 17 more. 2004
216 citations recorded by the source corpus.
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 $\sim 70T$.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/be00951126fe8843347f769f4416fd04a690941e
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In Condensed Matter Physics
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Two-band superconductor magnesium diboride (2008, background): “It should be noted that the values of Hc2 in C-alloyed HPCVD MgB2 films (over 60 T [42, 45]) are much higher than those found in the bulk C-doped MgB2 samples [205, 213].”