论文标题
镍超导体 - 一频哈伯德模型的复兴
Nickelate superconductors -- a renaissance of the one-band Hubbard model
论文作者
论文摘要
在发现了铜土中的超导性和安德森（Anderson）的开创性工作之后，理解高温超导性的理论努力在很大程度上集中在一个简单的模型上：一个波段哈伯德模型。但是，需要将超导粉提土掺杂，并且掺杂的孔进入氧轨道。这需要一个更复杂的多波段模型，例如三轨emery模型。乍一看，最近发现的镍超导体似乎是更复杂的多轨系统。在这里，我们分析了这个多轨系统，发现镍可以通过一个波段哈伯德模型来描述，尽管它具有额外的电子储层，并且仅围绕超导态度。我们对临界温度TC的计算与实验非常吻合，并表明最佳掺杂略低于参考文献的20％SR掺杂。 11。比3D镍含量更有前途的是4D palladates。
Following the discovery of superconductivity in the cuprates and the seminal work by Anderson, the theoretical efforts to understand high-temperature superconductivity have been focusing to a large extent on a simple model: the one-band Hubbard model. However, superconducting cuprates need to be doped, and the doped holes go into the oxygen orbitals. This requires a more elaborate multi-band model such as the three-orbital Emery model. The recently discovered nickelate superconductors appear, at first glance, to be even more complicated multi-orbital systems. Here, we analyse this multi-orbital system and find that it is instead the nickelates which can be described by a one-band Hubbard model, albeit with an additional electron reservoir and only around the superconducting regime. Our calculations of the critical temperature Tc are in good agreement with experiment, and show that optimal doping is slightly below the 20% Sr-doping of Ref. 11. Even more promising than 3d nickelates are 4d palladates.
