二聚氮化钴--一类潜在的新型高温超导体
Cobalt-dimer Nitrides -- a Potential Novel Family of High Temperature Superconductors
摘要：
我们预测由[Co $_2$ N $_2$ ] $^{2-}$类金刚石单元形成的正方形晶格层具有高温超导性。该层出现在稳定的三元氮化钴BaCo $_2$ N $_2$中。该材料的电子物理源于Co $_2$ N $_2$层，其中二聚Co对形成正方形晶格。费米能附近的低能物理可用有效双轨道模型描述。在不考虑层间耦合的情况下，两个轨道有效地解耦。这种电子结构满足了为非常规高温超导体提出的“基因”特征。我们预测，主要的超导配对不稳定性是由空穴掺杂从扩展的$s$波（s $^\pm$）驱动到$d$波的，例如Ba $_{1-x}$ K $_x$ Co $_2$ N $_2$ .该研究为建立非常规高温超导机制提供了新的平台。
英文摘要：
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.
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