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Fluctuation conductivity analysis on the Bi-based superconductors processed under same conditions

机译:在相同条件下处理的Bi基超导体的波动电导率分析

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摘要

We report electrical conductivity fluctuation measurements on different Bismuth-based granular samples synthesized under same processing conditions.Using the fluctuation conductivity Δσ as a function of the reduced temperature ε in the range -7 < lnε < 1, we identified Gaussian and critical fluctuation conductivity in (Bi,Pb)-2223 and Bi-2212 samples. Within the mean field region, samples show predominately two dimensional (2D) behaviour with exponent λ =- 1. Closer to critical temperature T_C, we have observed a crossover of λ from -2/3 to -1/3 in the critical region. The obtained exponents are consistent with 3D-XY model predictions. The regime with the critical exponent -2/3 is dominate in the case of (Bi,Pb)-2223 sample.
机译:我们报告了在相同加工条件下合成的不同铋基颗粒样品的电导率波动测量结果。使用波动率电导率Δσ作为温度ε在-7

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