Seebeck and Nernst effects in the mixed state of strongly fluctuating superconductors

• Published in: Physica. B, Condensed matter Vol. 695; p. 416549
• Main Authors: Nguyen, Luu Huu, Vi, Tran Ky, Tinh, Bui Duc
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.12.2024
• Subjects: Fe-based superconductor; Ginzburg–Landau Lawrence–Doniach model; Seebeck and Nernst effects; Strongly fluctuating superconductors; Seebeck and Nernst effects; Fe-based superconductor; Strongly fluctuating superconductors; Ginzburg–Landau Lawrence–Doniach model
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2024.416549

We study Seebeck and Nernst effects in strongly fluctuating superconductors by calculating the Seebeck and Nernst coefficients in the Ginzburg–Landau Lawrence–Doniach model with thermal noise. Strongly thermal fluctuations are represented by the Langevin thermal noise. To capture the interesting fluctuation effects, we use the self-consistent Gaussian approximation to treat cubic term in the equation of motion. Our results including all Landau levels are to treat arbitrary magnetic fields. The Seebeck and Nernst coefficients are calculated for arbitrary temperature and magnetic field. The results are compared to experimental data on Fe-based superconductor Fe1+yTe0.6Se0.4 in both the superconducting state below the critical temperature Tc and the normal state above Tc. Our calculation supports the picture of phase disordering of fluctuations above Tc in Fe-based superconductors. •The GL model is used to investigate the Seebeck and Nernst effects in fluctuating superconductor.•The Seebeck and Nernst coefficients are calculated for arbitrary temperature and magnetic field.•The results are compared to experimental data on Fe-based superconductor in around Tc.•Our calculation supports the picture of phase disordering of fluctuations above Tc.