论文标题
钴二聚体氮化物 - 潜在的高温超导体家族
Cobalt-dimer Nitrides -- a Potential Novel Family of High Temperature Superconductors
论文作者
论文摘要
我们预测[Co $ _2 $ n $ _2 $] $^{2 - } $类似钻石的单元可以容纳高温超导性。该层出现在稳定的三元钴氮化物中，baco $ _2 $ n $ _2 $。材料的电子物理源于Co $ _2 $ n $ _2 $层，其中二聚二氧化配对形成方形晶格。 Fermi能量附近的低能物理可以通过有效的两个轨道模型来描述。不考虑层间耦合，这两个轨道有效地脱钩。该电子结构满足了针对非常规高温超导体提出的“基因”特征。我们预测，领先的超导配对不稳定性将从扩展的$ s $ - 波（s $^\ pm $）驱动到$ d $ - 波掺杂的$ d $ wave，例如在ba $ _ {1-x} $ k $ _x $ _x $ _x $ _x $ _2 $ $ _2 $ _2 $ n $ _2 $ _2 $ _2 $。这项研究提供了一个新的平台，以建立非常规高温超导性的超导机制。
We predict that the square lattice layer formed by [Co$_2$N$_2$]$^{2-}$ diamond-like units can host high temperature superconductivity. The layer appears in the stable ternary cobalt nitride, BaCo$_2$N$_2$. The electronic physics of the material stems from Co$_2$N$_2$ layers where the dimerized Co pairs form a square lattice. The low energy physics near Fermi energy can be described by an effective two orbital model. Without considering interlayer couplings, the two orbitals are effectively decoupled. This electronic structure satisfies the "gene" character proposed for unconventional high temperature superconductors. We predict that the leading superconducting pairing instability is driven from an extended $s$-wave (s$^\pm$) to a $d$-wave by hole doping, for example in Ba$_{1-x}$K$_x$Co$_2$N$_2$. This study provides a new platform to establish the superconducting mechanism of unconventional high temperature superconductivity.
