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Fluctuation conductivity in two-band superconductor SmFeAsO0.8F0.2

Askerzade I. N., Tagiyeva-Askerbeyli R. T.

Materials Science Poland

2015

Vol. 33, No. 3

644--648

In this study we have calculated the fluctuation conductivity near critical temperature of SmFeAsO0.8F0.2 superconductor using two-band Ginzburg-Landau theory. It was illustrated that in the absence of external magnetic field, the two-band model reduced to a single effective band theory with modified temperature dependences. The calculations revealed three-dimensional character of fluctuations of conductivity in the new Fe-based superconductor SmFeAsO0.8F0.2. It has been shown that such a model is in good agreement with experimental data for this compound.

Specific heat jump of two-band superconductor KFe2As2 using Ginzburg-Landau theory

Askerzade I N

Materials Science Poland

2014

Vol. 32, No. 3

465--469

In this study specific heat jump using two-gap Ginzburg-Landau (GL) theory has been calculated. In contrast to the previous approaches, we have taken into account intergradient order parameters interaction in the GL free energy functional. The thermodynamic magnetic field revealed nonlinear temperature dependence due to interband interaction between order parameters and their gradients. The calculations showed that the specific heat jump in two-order parameter superconductors was smaller than that of single-order parameter superconductors. It has been shown that such a model is in good agreement with experimental data for KFe2As2 superconductors.