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

Askerzade İ.

MATERIALS SCIENCE-POLAND, vol.32, no.3, pp.465-469, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 32 Issue: 3
  • Publication Date: 2014
  • Doi Number: 10.2478/s13536-014-0212-2
  • Journal Name: MATERIALS SCIENCE-POLAND
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.465-469
  • Keywords: Fe based superconductors, Ginzburg-Landau theory, specific heat jump, two-band superconductivity, LAYERED SUPERCONDUCTOR, IRON, TEMPERATURE, WAVE
  • Ankara University Affiliated: Yes

Abstract

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.