论文标题
自旋波动对V和NB中超导性的影响：第一原理研究
Effect of spin fluctuations on superconductivity in V and Nb: a first-principles study
论文作者
论文摘要
我们研究了典型的$ d $ band元素超导体V和NB的超导率，其最近开发的非经验计算方案基于超导体的密度函数理论。铁磁波动（paramagnon）对超导过渡温度（$ t _ {\ rm c} $）的影响，原则上抑制了$ s $ - 波超导配对，而无需任何经验参数。我们表明，强的paramagnon效应取消了$ t _ {\ rm c} $ - 增强声子介导的配对和动态筛选的库仑相互作用的增强效果。
We study the superconductivity in typical $d$-band elemental superconductors V and Nb with the recently developed non-empirical computational scheme based on the density functional theory for superconductors. The effect of ferromagnetic fluctuation (paramagnon) on the superconducting transition temperature ($T_{\rm c}$), which in principle suppress the $s$-wave superconducting pairing, is quantified without any empirical parameter. We show that the strong paramagnon effect cancels the $T_{\rm c}$-enhancing effects of the phonon-mediated pairing and dynamical screened Coulomb interaction.
