Abstract
The Y3Ba5Cu8O18 superconductors are synthesised using the solid state reaction method under different annealing conditions. Structure characterisation using X-ray diffraction shows that the lattice parameters are different from those of the standard YBCO system. The resistivity measurements are performed using the four-probe method in the temperature range from 77 to 300 K. The electrical resistivity indicates the transition temperature T c (O2)=100.2 K and T c (air)=92.3 K. Thermal fluctuations were experimentally studied. The correlations of the critical exponents with the dimensionality of the fluctuation system for each Gaussian regime were performed using the Aslamazov-Larkin theory. Near T c , a critical regime with a critical exponent of λ CR=0.35 is effectively described by the E-model.
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This work was supported by the Turkish Atomic Energy Authority (Project No: A3H3P1.01).
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Akduran, N. Superconducting Fluctuations in Polycrystalline Y3Ba5Cu8O18 . J Low Temp Phys 168, 323–333 (2012). https://doi.org/10.1007/s10909-012-0629-0
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DOI: https://doi.org/10.1007/s10909-012-0629-0