Theory of thermal fluctuations in two-band superconductors under an essentially homogeneous magnetic field is developed within the framework of the two-band Ginzburg-Landau theory. The fluctuating specific heat is calculated by using the optimized self-consistent perturbation approach and the results are applied to analyze the thermodynamic data of the iron-based superconductors Ba1-xKxFe2As2 with x~0.4, which have been suggested to have a two-band structure by recent experiments. We estimate the fluctuation strength in this material and find that the specific heat is described well with the Ginzburg number Gi=4·10-4. The influence of interband coupling strength is investigated and the result of the two-band Gaussian approximation approach is compared.
Project supported by the National Natural Science Foundation of China (Grant No. 11674007).
- Lei Qiao, Cheng Chi, Jiangfan Wang. Fluctuating specific heat in two-band superconductors[J]. Chin. Phys. B, 2017, 26(11): 117401.