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首页> 外文期刊>International Journal of Electrochemical Science >Superconducting Fluctuations and Excess Conductivity Analysis of Re Substituted (Tl1-xRex)Sr2CaCu2O7-σ
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Superconducting Fluctuations and Excess Conductivity Analysis of Re Substituted (Tl1-xRex)Sr2CaCu2O7-σ

机译：取代（Tl 1-x Re x ）Sr 2 CaCu 2 O的超导涨落和电导率分析7-σ

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摘要

Samples with nominal starting compositions (Tl1-xRex)Sr2CaCu2O7- (x = 0.05- 0.30) were prepared bythe solid state reaction method. Superconducting fluctuations and excess conductivity analysis wascarried out using the Aslamazov-Larkin (AL) theory to determine the dimension of fluctuation inducedconductivity . The Lawrence-Donaich (LD) theory was used to calculate the coherence length c(0),Josephson coupling J, and anisotropy = (ab(0)/c(0)). XRD patterns indicated that the samples weredominantly Tl-1212 phase. Substitution of Re in place of Tl in (Tl1-xRex)Sr2CaCu2O7- showed Tc onsetbetween 70 K (x = 0.05) and 82 K (x = 0.25). Excess conductivity analyses showed that Resubstitution induced 2D-to-3D conductivity transition with the highest transition temperature, T2DDobserved at x = 0.25. The calculations based on Lawrence-Doniach model showed the shortestcoherence length, c(0) and highest anisotropy( =13.42 ) for the x = 0.25 sample.
机译：通过固态反应方法制备具有标称起始组成（Tl1-xRex）Sr2CaCu2O7-（x = 0.05- 0.30）的样品。利用Aslamazov-Larkin（AL）理论进行超导涨落和超导率分析，以确定涨落引起的电导率的维数。劳伦斯-多纳奇（LD）理论用于计算相干长度c（0），Josephson耦合J和各向异性=（ab（0）/ c（0））。 XRD图谱表明样品主要是Tl-1212相。在（Tl1-xRex）Sr2CaCu2O7-中用Re代替T1显示Tc在70 K（x = 0.05）和82 K（x = 0.25）之间发生。过量的电导率分析表明，Resubstitution诱导的2D到3D电导率转换具有最高的转变温度T2DD，在x = 0.25处观察到。基于Lawrence-Doniach模型的计算显示，对于x = 0.25的样本，最短相干长度c（0）和最高各向异性（= 13.42）。

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