Fluctuating specific heat in two-band superconductors

doi:10.1088/1674-1056/26/11/117401

Abstract

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 Ba_1-xK_xFe₂As₂ 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.

Keywords: fluctuating specific heat two-band superconductors vortex liquid self-consistent approximation

Received: 14 July 2017
Revised: 14 August 2017
Accepted manuscript online:

PACS:	74.25.Bt	(Thermodynamic properties)
	74.25.Ha	(Magnetic properties including vortex structures and related phenomena)
	74.40.-n	(Fluctuation phenomena)
	74.25.Uv	(Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses))

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 11674007).

Corresponding Authors: Lei Qiao
E-mail: leiqiao@pku.edu.cn

Cite this article:

Lei Qiao(乔雷), Cheng Chi(迟诚), Jiangfan Wang(王江帆) Fluctuating specific heat in two-band superconductors 2017 Chin. Phys. B 26 117401

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[1]	Theory of specific heat of vortex liquid of high T_c superconductors Chen Bai(白晨), Cheng Chi(迟诚), Jiangfan Wang(王江帆). Chin. Phys. B, 2016, 25(10): 107404.

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