Abstract
We investigate the superconducting fluctuation optical conductivity using the time-dependent Ginzburg–Landau Lawrence–Doniach model with thermal noise describing strong thermal fluctuation in iron-based superconductors. The superconducting fluctuation optical conductivity as temperature in the homogeneous phase is calculated. The experimental data of iron-based superconductors FeSe\(_{0.5}\)Te\(_{0.5}\) are fitted using the theoretical result based on the self-consistent Gaussian approximation. Our results show the real and imaginary part of the superconducting fluctuation optical conductivity in a wide region around T\(_{c}\) are well described by the theoretical formula. The superfluid density is also in good agreement with the experimental data in both the superconducting state below T\(_{c}\) and the normal state above T\(_{c}\). It shows that the superfluid density and the imaginary portion of the optical conductivity are still non-zero and considerably large for temperature above Tc, indicating the residual superconductivity above Tc due to strong thermal fluctuations.
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AcknowledgementsL. H. Nguyen is thankful to Van Lang University.
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LHN and BDT developed the theoretical formalism, performed the analytic calculations and LMT performed the numerical simulations. All authors contributed to the final version of the manuscript.
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Nguyen, L.H., Thu, L.M. & Tinh, B.D. The superconducting fluctuation optical conductivity of iron-based superconductors. Eur. Phys. J. B 96, 117 (2023). https://doi.org/10.1140/epjb/s10051-023-00589-w
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DOI: https://doi.org/10.1140/epjb/s10051-023-00589-w