The superconducting fluctuation optical conductivity of iron-based superconductors

Luu Huu Nguyen (), Le Minh Thu and Bui Duc Tinh ()
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Luu Huu Nguyen: Van Lang University
Le Minh Thu: Hanoi National University of Education
Bui Duc Tinh: Hanoi National University of Education

The European Physical Journal B: Condensed Matter and Complex Systems, 2023, vol. 96, issue 8, 1-6

Abstract: 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 $$_{0.5}$$ 0.5 Te $$_{0.5}$$ 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 $$_{c}$$ 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 $$_{c}$$ c and the normal state above T $$_{c}$$ 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. Graphic Abstract

Date: 2023
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DOI: 10.1140/epjb/s10051-023-00589-w

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