Abstract
The flux dynamics in LaO0.92F0.08FeAs polycrystalline samples has been investigated looking at the first and higher harmonics of the AC magnetic susceptibility. The investigation of the real and imaginary part of the first harmonic shows that the critical temperature is reduced when the applied DC field increases. Moreover, the intergrain and intragrain contributions persist up to the highest applied DC field, suggesting that the electromagnetic connection among the superconducting grains is strong in spite of the estimated very short coherence length. Concerning the higher harmonics, a comparison between the absolute value of the real part of the first harmonic and the sum of the higher harmonics clearly indicates the activation of a linear regime below the superconducting critical temperature. Furthermore, the temperature range where this linear regime is activated is smaller than the one found in cuprate perovskite superconductors.
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Zola, D., Polichetti, M., Adesso, M.G. et al. Granularity and Linear Flux Dynamics in Sintered LaO0.92F0.08FeAs. J Supercond Nov Magn 22, 609–612 (2009). https://doi.org/10.1007/s10948-009-0477-6
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DOI: https://doi.org/10.1007/s10948-009-0477-6