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首页> 外文期刊>International Journal of Electrochemical Science >Formation and Fluctuation-Induced Conductivity of (Tl1-xBix)Sr2CaCu2O7-δ (x = 0.1- 0.7) Superconductor
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Formation and Fluctuation-Induced Conductivity of (Tl1-xBix)Sr2CaCu2O7-δ (x = 0.1- 0.7) Superconductor

机译：（Tl 1-x Bi x ）Sr 2 CaCu 2 O 7-δ（x = 0.1- 0.7）超导体

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The (Tl1-xBix)Sr2CaCu2O7- (x = 0.1, 0.2, 0.3, 0.4, 0.5,and 0.7) samples were prepared by the solid- state reaction method. The samples were studied by powder X-ray diffraction method, electricalresistance measurements and energy dispersive X-ray analysis (EDX). All samples showed adominant Tl-1212 phase with volume fraction approximately 85%. The Aslamazov-Larkin (AL)theory was used to analyze the excess conductivity. The dimension of fluctuation inducedconductivity was also determined using the AL theory. The coherence length c(0), Josephsoncoupling J, and anisotropy = (ab(0)/c(0)) of the samples was calculated using the Lawrence- Donaich (LD) theory. Substituting Bi into (Tl1-xBix)Sr2CaCu2O7- (Tl-1212) caused an initial increasein the zero-resistance-temperature (Tc zero). The samples with x = 0.3 and 0.4 showed the highest Tc onset(101 K). Excess conductivity analyses showed that Bi substitution induced 2D-to-3D conductivitytransition with the highest transition temperature, T2DD observed at x = 0.3. The shortest coherencelength, c(0) and lowest interplanar coupling, J was observed in the x = 0.7 which is in the under-dopedstate.
机译：（Tl1-xBix）Sr2CaCu2O7-（x = 0.1、0.2、0.3、0.4、0.5和0.7）样品是通过固态反应方法制备的。通过粉末X射线衍射法，电阻测量和能量色散X射线分析（EDX）研究了样品。所有样品均显示占优势的Tl-1212相，其体积分数约为85％。 Aslamazov-Larkin（AL）理论用于分析过剩的电导率。波动感应电导率的维数也使用AL理论确定。样本的相干长度c（0），约瑟夫森耦合J和各向异性=（ab（0）/ c（0））使用劳伦斯-多纳奇（LD）理论计算。将Bi代入（Tl1-xBix）Sr2CaCu2O7-（Tl-1212）导致零电阻温度（Tc零）的初始增加。 x = 0.3和0.4的样品显示最高的Tc起始（101 K）。过量的电导率分析表明，Bi取代导致2D到3D的电导率转变，最高的转变温度T2DD在x = 0.3处观察到。在未掺杂状态的x = 0.7中观察到了最短的相干长度c（0）和最低的面内耦合J。

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