论文标题
F-D Kondo云对镍超导性的影响
Impacts of f-d Kondo cloud on superconductivity of nickelates
论文作者
论文摘要
超导镍的发现重新点燃了希望阐明高$ t _ {\ textrm {c}} $超导性机制。在库酸酯中，超导间隙在准2D费米表面的单带上打开，镍含量具有多波段的电子结构的3D性质。这就对高$ t _ {\ textrm {c}} $超导性的2D性质的作用提出了一个严重的问题。在这里，采用动态平均场理论与GW方法相结合，我们发现ND-4 $ F $和NI-3 $ d $电子在低温下出现的NI-4 $ F $和NI-3 $ d $电子的强相关性所驱动的临界效应。近藤效应修饰了Fermi表面的拓扑结构，导致3D多波段性质。值得注意的是，近距离调制很容易破坏，从而导致准2D性质。我们的发现清楚地说明了ndnio $ _ {2} $和胶片之间超导性和明显的电阻率行为的不一致。
The discovery of superconducting nickelates reignited hope for elucidating the high-$T_{\textrm{c}}$ superconductivity mechanism in the isostructural cuprates. While in the cuprates, the superconducting gap opens up on a single-band of the quasi-2D Fermi surface, the nickelates are known to have 3D nature of electronic structure with multi-band. This raises a serious question about the role of 2D nature for the high-$T_{\textrm{c}}$ superconductivity. Here, employing dynamical mean field theory combined with GW method, we found the Kondo effect driven by the strong correlation of Nd-4$f$ and Ni-3$d$ electrons emerging at low temperature. The Kondo effect modifies the topology of the Fermi surface leading to 3D multi-band nature. Remarkably, the Kondo effect is easily destroyed by lattice modulation, leading to the quasi-2D nature. Our findings clearly explain the inconsistent occurrence of superconductivity and distinct electrical resistivity behavior between NdNiO$_{2}$ bulk and films.
