Fluctuating specific heat in two-band superconductors

• 来源期刊: 中国物理B（英文版）
• 关键词: fluctuating specific heat two-band superconductors vortex liquid self-consistent approximation
• 年，卷（期）: 2017,（11）
• 页码范围: 469-474
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/26/11/117401

摘要

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.