论文标题
BACUS2：具有中等电子电子相关性的超导体
BaCuS2: a superconductor with moderate electron-electron correlation
论文作者
论文摘要
我们表明，分层的BACUS $ _2 $是一个中等相关的电子系统，其中CUS层的电子结构与Cutrates和Iraled Basic Superoxoductors中的电子结构相似。理论计算表明，平面$ d $ - $ p $ $σ^*$ - 债券带在费米级别附近隔离。由于$ d $和$ p $轨道之间的能量分离要比丘比特和基于铁的超导体小得多，因此BACUS $ _2 $有望适度相关。我们建议这种材料是研究两个不同的超导配对机制之间的竞争性/协作性质的理想系统，即常规的BCS电子互动和电子电子相关性，这可能有助于建立无关紧要的高质量超导电性难以置信的机制。
We show that the layered-structure BaCuS$_2$ is a moderately correlated electron system in which the electronic structure of the CuS layer bears a resemblance to those in both cuprates and iron-based superconductors. Theoretical calculations reveal that the in-plane $d$-$p$ $σ^*$-bonding bands are isolated near the Fermi level. As the energy separation between the $d$ and $p$ orbitals are much smaller than those in cuprates and iron-based superconductors, BaCuS$_2$ is expected to be moderately correlated. We suggest that this material is an ideal system to study the competitive/collaborative nature between two distinct superconducting pairing mechanisms, namely the conventional BCS electron-phonon interaction and the electron-electron correlation, which may be helpful to establish the elusive mechanism of unconventional high-temperature superconductivity.
