Physics – Condensed Matter – Superconductivity
Scientific paper
2008-11-08
Physics
Condensed Matter
Superconductivity
7 pages, 7 figures, submitted to Phys. Rev. B
Scientific paper
10.1088/0953-2048/22/5/055004
We present experimental results of the upper critical fields $H_{\rm c2}$ of various MgB$_2$ thin films prepared by the molecular beam epitaxy, multiple-targets sputtering, and co-evaporation deposition apparatus. Experimental data of the $H_{\rm c2}(T)$ are successfully analyzed by applying the Gurevich theory of dirty two-band superconductivity in the case of $D_{\pi}/D_{\sigma}>1$, where $D_{\pi}$ and $D_{\sigma}$ are the intraband electron diffusivities for $\pi$ and $\sigma$ bands, respectively. We find that the parameters obtained from the analysis are strongly correlated to the superconducting transition temperature $T_{\rm c}$ of the films. We also discuss the anormalous narrowing of the transition width at intermediate temperatures confirmed by the magnetoresistance measurements.
Harada Yoshifumi
Iriuda H.
Ishida Takekazu
Kuribayashi A.
Miki Sachiko
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