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Reduced Three-Dimensional (3D) Conductivity in Fe Doped CuTl-1223 Superconductors
並列摘要
The excess conductivity of Fe doped Cu0:5Tl0:5Ba2Ca2Cu3-yFeyO10-δ, with y = 0, 0.02, 0.03, 0.05, 0.075 samples is investigated for comparison of the dimensionality of fluctuations above the mean-field critical temperature. It is observed from these studies that at lower temperatures (close to the transition temperature), the fluctuation in the order parameter of the carriers follows a three dimensional (3D) behavior, whereas at high temperature it follows a two dimensional (2D) behavior. From the analysis of our results, we evaluated the exponents, the coherence length, the crossover temperature, and inter-layer coupling strength (J) of the Fe doped and undoped samples. This striking linear depression of Tc (R = 0) and the magnitude of diamagnetism can be correlated with the decreased width of the 3D and 2D regimes with increased Fe concentrations. The crossover temperature from 2D to 3D has substantially been shifted to a lower temperature with increasing Fe doping, which may possibly be due to an enhanced interaction of the ferromagnetic spin of Fe^(+3) with the mobile free carriers in the CuO2 planes, this scattering also promotes a reduction in the coherence length of the carriers along the c-axis.
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