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Systematic characterization of upper critical fields for MgB$_2$ thin films using the two-band superconducting theory
- Publication Year :
- 2008
-
Abstract
- 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.<br />Comment: 7 pages, 7 figures, submitted to Phys. Rev. B
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.0811.1253
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1088/0953-2048/22/5/055004