Landau level approximation

In this paper, the complex conductivity including all Landau levels is calculated in a layered superconductor under magnetic field in the vortex liquid phase by using TDGL approach with thermal fluctuations modelled by the Langevin white noise. We obtain an expression summing all Landau levels in an explicit form. The rest of the paper is organized as follows. In section 2, the Lawrence-Donich model in its time dependent form is briefly recalled and the main assumptions are specified.

8p runordie3 27-06-2022 17 2   Download

The time-dependent Ginzburg-Landau (TDGL) equation with thermal noise is used to calculate the complex fluctuation conductivity in high-Tc superconductor in three dimensional (3D) model at zero magnetic field. The nonlinear interaction term in the TDGL is treated within self-consistent Gaussian approximation we go beyond the often used lowest Landau level approximation.

7p vijichoo2711 04-06-2021 11 1   Download

We investigate effect of higher Landau levels on the transverse thermoelectric conductivity αxy, describing the Nernst effect in high-Tc superconductors, by using the time-dependent Ginzburg-Landau theory in two-dimensional model with thermal noise. The transverse thermoelectric conductivity is calculated in the self-consistent Gaussian approximation. Our results indicate that the contribution of higher Landau levels is less than that of lower Landau levels to the transverse thermoelectric conductivity. Our results are in good agreement with experimental data on high-Tc superconductor.

7p thuyliebe 08-10-2018 33 1   Download