Fluctuating specific heat in two-band superconductors

被引：1
|
作者：
Qiao, Lei [1 ]
Chi, Cheng [1 ]
Wang, Jiangfan [1 ]
机构：
[1] Peking Univ, Sch Phys, Beijing 100871, Peoples R China
来源：
CHINESE PHYSICS B | 2017年 / 26卷 / 11期
基金：
中国国家自然科学基金;
关键词：
fluctuating specific heat; two-band superconductors; vortex liquid; self-consistent approximation; HIGH-TEMPERATURE SUPERCONDUCTORS; THERMAL-CONDUCTIVITY; II SUPERCONDUCTORS; TRANSITION;
D O I：
10.1088/1674-1056/26/11/117401
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
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 NBa1-xKxFe2As2 with x similar to 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.
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页数：6
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