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- W1645135874 abstract "We present an analysis of the measured excess conductivity that results from the fluctuations of the superconducting order parameter for a single crystal of the ${mathrm{Bi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{CaCu}}_{2}$${mathrm{O}}_{mathit{x}}$ high-${mathit{T}}_{mathit{c}}$ superconductor. The measured excess conductivity in the temperature range 84--245 K is best fitted by the two-dimensional (2D) Aslamazov-Larkin theory. By using this theory, the 2D characteristic length was obtained to be 12.6 AA{}, which is within a physically acceptable range. We find that the interlayer coupling strength predicted by the Lawrence-Doniach theory leads to too small a value of the c-direction coherence length. This seems to be an intrinsic property of this superconductor due to its high anisotropy. Further, the indirect Maki-Thompson effect is found to be negligible. Thus we claim that the excess conductivity of the ${mathrm{Bi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{CaCu}}_{2}$${mathrm{O}}_{mathit{x}}$ single crystal is solely caused by the two-dimensional thermal fluctuations of the order parameter with the absence of the 2D-3D crossover and that the effect of fluctuating Cooper pairs in association with pair breakers is negligible in considering the excess conductivity." @default.
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- W1645135874 title "Conductivity fluctuations in a single crystal of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:…" @default.
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- W1645135874 doi "https://doi.org/10.1103/physrevb.48.6703" @default.
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