论文标题
莫特 - 哈伯德景观的掺杂演变是无限层的镍
Doping evolution of the Mott-Hubbard landscape in infinite-layer nickelates
论文作者
论文摘要
最近对ND $ _ {0.8} $ sr $ _ {0.2} $ nio $ _2 $的超导性观察提出了有关基础电子结构层次结构的基本问题。计算表明，该系统属于莫特 - 哈伯德制度，而不是其他镍氧化物和超导层次的电荷转移构型。在这里，我们使用最先进的，本地分辨的电子能量损失光谱来直接探测nd $ _ {1-x} $ sr $ _x $ nio $ nio $ _2 $的Mott-Hubbard角色。掺杂后，我们观察到了新兴的杂交，让人联想到Zhang-rice Singlet通过氧气投射状态，ND 5 $ D $状态的修改以及Ni 3 $ d $ d $杂交和填充的系统演化。这些结果清楚地证明了该系统的多功能性质以及无限层镍盐的独特电子景观，尽管它们与丘比特的正式相似。
The recent observation of superconductivity in Nd$_{0.8}$Sr$_{0.2}$NiO$_2$ has raised fundamental questions about the hierarchy of the underlying electronic structure. Calculations suggest that this system falls in the Mott-Hubbard regime, rather than the charge-transfer configuration of other nickel oxides and the superconducting cuprates. Here, we use state-of-the-art, locally-resolved electron energy loss spectroscopy to directly probe the Mott-Hubbard character of Nd$_{1-x}$Sr$_x$NiO$_2$. Upon doping, we observe emergent hybridization reminiscent of the Zhang-Rice singlet via the oxygen-projected states, modification of the Nd 5$d$ states, and the systematic evolution of Ni 3$d$ hybridization and filling. These results clearly evidence the multiband nature of this system and the distinct electronic landscape for infinite-layer nickelates despite their formal similarity to the cuprates.
