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Superconductivity in Ce-based heavy-fermion systems under high pressure

机译:高压CE基重型系统中的超导性

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摘要

In this paper, the possibility of a superconducting state mediated by the valence fluctuations in Ce-based heavy-fermion systems under high pressure is investigated for the extended periodic Anderson model. In this extended version, an additional local Coulomb repulsion between the localized and conduction electrons is included. In the framework of the projector-based renormalization method, we derive self-consistent equations for the superconducting order parameters. Our numerical evaluation for a two-dimensional case specifies that superconductivity in the heavy-fermion systems has a d-wave character and is mediated by valence fluctuations. By use of some additional simplifications, a BCS-like equation is found; an effective pairing interaction then is delivered. The interaction depends strongly on momentum and becomes dominant in the valence transition regime.
机译:本文研究了在高压下,通过Ce基重型系统中的价值波动介导的超导状态的可能性进行了延长的周期性的安德森模型。在该扩展版本中,包括局部和传导电子之间的额外局部库仑排斥。在基于投影仪的重新运算方法的框架中,我们推出了超导顺序参数的自我一致方程。我们对二维壳的数值评估规定了重型系统中的超导性具有D波形,并且由价波动介导。通过使用一些额外的简化,发现了一种类似BCS等方程式;然后提供有效的配对交互。相互作用强烈取决于势头,在价转变制度中变得占主导地位。

著录项

  • 来源
    《Physical review》 |2020年第24期|245120.1-245120.12|共12页
  • 作者

    Van-Nham Phan;

  • 作者单位

    Institute of Research and Development Duy Tan University Da Nang 550000 Vietnam and Faculty of Natural Sciences Duy Tan University Da Nang 550000 Vietnam;

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  • 正文语种 eng
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