Seebeck and Nernst effects in the mixed state of strongly fluctuating superconductors

IF 2.8 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER Physica B-condensed Matter Pub Date : 2024-09-18 DOI:10.1016/j.physb.2024.416549

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Abstract

We study Seebeck and Nernst effects in strongly fluctuating superconductors by calculating the Seebeck and Nernst coefficients in the Ginzburg–Landau Lawrence–Doniach model with thermal noise. Strongly thermal fluctuations are represented by the Langevin thermal noise. To capture the interesting fluctuation effects, we use the self-consistent Gaussian approximation to treat cubic term in the equation of motion. Our results including all Landau levels are to treat arbitrary magnetic fields. The Seebeck and Nernst coefficients are calculated for arbitrary temperature and magnetic field. The results are compared to experimental data on Fe-based superconductor Fe

_{1 + y}

Te_0.6Se_0.4 in both the superconducting state below the critical temperature

T_{c}

and the normal state above

T_{c}

. Our calculation supports the picture of phase disordering of fluctuations above

T_{c}

in Fe-based superconductors.

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强波动超导体混合态中的塞贝克效应和内斯特效应

我们通过计算带有热噪声的金兹堡-朗道-劳伦斯-多尼亚赫模型中的塞贝克系数和纳斯特系数，研究了强波动超导体中的塞贝克效应和纳斯特效应。强热波动由朗格文热噪声表示。为了捕捉有趣的波动效应，我们使用自洽高斯近似来处理运动方程中的立方项。我们的结果包括所有朗道水平，用于处理任意磁场。我们计算了任意温度和磁场下的塞贝克系数和奈恩斯特系数。计算结果与铁基超导体 Fe1+yTe0.6Se0.4 在临界温度 Tc 以下的超导态和 Tc 以上的正常态的实验数据进行了比较。我们的计算结果支持铁基超导体在临界温度 Tc 以上波动相位紊乱的观点。

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来源期刊

Physica B-condensed Matter 物理-物理：凝聚态物理

CiteScore

4.90

自引率

7.10%

发文量

703

审稿时长

44 days

期刊介绍： Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces