Fluctuation-Induced Conductivity of Carbon in Glucose-Doped MgB₂ Superconductor

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• 作者：Intikhab A. Ansari ; Jafar M. Parakkandy&#8230
• 关键词：Fluctuation ; induced conductivity ; Magnesium diboride ; Carbon doping ; Transition temperature ; Resistivity
• 刊名：Arabian Journal for Science and Engineering
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：42
• 期：1
• 页码：383-388
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Engineering, general; Science, Humanities and Social Sciences, multidisciplinary;
• 出版者：Springer Berlin Heidelberg
• ISSN：2191-4281
• 卷排序：42

文摘

Fluctuation-induced conductivity (FIC) of glucose as a carbon-doped MgB₂ sample was investigated in the presence of a magnetic field in the range of 0–14T. Different concentrations (0–8%) of glucose-doped MgB₂ samples were prepared using planetary dry ball milling and then employed standard solid-state reaction method on these samples. The prepared samples were characterized by X-ray diffractometer. The resistive transition broadening of all the samples becomes wider as the magnetic field was increased. The results of doped MgB₂ explained in terms of temperature derivative of the resistivity, d\({\rho/{\rm d}T}\) with temperature. The mean field transition temperature (\({T_{{c}}^{{\rm mf}}}\)) has been taken from the peak of the temperature derivative of resistivity plot for different doped samples. It is clear that \({T_{{c}}^{{\rm mf}}}\) of d\({\rho/{\rm d}T}\) shifted to lower temperature region as we increase the magnetic field of the doped samples. Lawrence and Doniach model has been employed for the present study. The variation of FIC against inverse reduced temperature (\({{\varepsilon}^{-1})}\) for different concentrations of glucose-doped MgB₂ samples was measured with varying applied field. The enhancement of coherence length observed as we decrease the value of T_cand \({T_{{c}}^{{\rm mf}}}\) for 5 and 8% C in glucose-doped MgB₂ samples when subjected to a different field.