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27 April 2024

» arxiv » 0811.1253

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Systematic characterization of upper critical fields for MgB$_2$ thin films using the two-band superconducting theory
S. Noguchi ; A. Kuribayashi ; T. Ishida ; T. Oba ; H. Iriuda ; M. Yoshizawa ; Y. Harada ; S. Miki ; H. Shimakage ; Z. Wang ; K. Satoh ; T. Yotsuya ;
Date:	8 Nov 2008
Abstract:	We present experimental results of the upper critical fields $H_{ m c2}$ of various MgB$_2$ thin films prepared by the molecular beam epitaxy, multiple-targets sputtering, and co-evaporation deposition apparatus. Experimental data of the $H_{ m c2}(T)$ 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 $T_{ m c}$ of the films. We also discuss the anormalous narrowing of the transition width at intermediate temperatures confirmed by the magnetoresistance measurements.
Source:	arXiv, 0811.1253
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