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Magnetic fluctuations and superconducting pairing in ∈-iron

机译：∈铁中的磁波动和超导配对

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摘要

We study Coulomb correlation effects and their role in superconductivity of ε-iron under pressure from 12 to 33 GPa by using a combination of density functional and dynamical mean-field theory. Our results indicate a persistence of the Fermi-liquid behavior below the temperature ～ 1000 K. The Coulomb correlations are found to substantially renormalize the density of states, reducing the distance from the peak to the Fermi level to 0.4 eV compared to 0.75 eV obtained in DFT calculations. We find significant antiferromagnetic correlations. which are accompanied by the formation of short-lived local magnetic moments. We use the obtained results as a starting point for construction of the multiband Bethe-Salpeter equation, which eigenvalues indicate that antiferromagnetic spin fluctuations may result in the superconducting pairing in s-Fe. Moreover, the tendency to superconducting instability becomes weaker with the increase of pressure, which may explain the disappearance of superconductivity at ～30 GPa.
机译：通过使用密度函数和动态平均场理论的组合，研究库仑相关效应及其在压力下ε-铁的超导性的作用。我们的结果表明，低于温度〜1000k的费米液行为的持续存在。发现库仑相关性基本上称为状态的密度，与0.75 eV相比，从峰值到FERMI水平的距离降低到0.4eV。 DFT计算。我们发现了显着的反铁磁性相关性。伴随着形成短居民的局部磁性时刻。我们将获得的结果用作构建多频带贝特 - Salpeter方程的起始点，该特征值表明防冻旋转波动可能导致S-Fe中的超导配对。此外，随着压力的增加，超导不稳定性的趋势变弱，这可以解释〜30GPa在〜30GPa下的超导电性消失。

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  • 来源
    《Physical review》 |2020年第15期|155126.1-155126.9|共9页
  • 作者

    A. S. Belozerov; A. A. Katanin; V. Yu. Irkhin; V. I. Anisimov;

  • 作者单位

    M. N. Miheev Institute of Metal Physics Russian Academy of Sciences 620108 Yekaterinburg Russia Ural Federal University 620002 Yekaterinburg Russia;

    Moscow Institute of Physics and Technology 141701 Dolgoprudny Russia M. N. Miheev Institute of Metal Physics Russian Academy of Sciences 620108 Yekaterinburg Russia;

    M. N. Miheev Institute of Metal Physics Russian Academy of Sciences 620108 Yekaterinburg Russia Ural Federal University 620002 Yekaterinburg Russia;

    M. N. Miheev Institute of Metal Physics Russian Academy of Sciences 620108 Yekaterinburg Russia Ural Federal University 620002 Yekaterinburg Russia;

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