论文标题
CRB中的混合S波超导率$ _2 $
Hybrid s-wave superconductivity in CrB$_2$
论文作者
论文摘要
在具有多个费米口袋的金属中，由于旋转波动而导致的电子偶联或非常规，因此S波超导的形成可能是常规的。我们分析了六边形的二吡啶CRB $ _2 $，这是一种在环境条件下的巡回反铁磁铁，并在压力增加时变成超导。尽管T $ _C $的高压行为暗示了常规的S波配对，但我们发现促进非常规S波配对的自旋波动在反铁磁圆顶的附近变得很重要。由于S波状态的对称类别独立于其基本机制，因此我们认为CRB $ _2 $是实现混合S波超导体的一种实现，在该机制中，非常规和常规的S波机制组合形成联合超导圆顶。
In a metal with multiple Fermi pockets, the formation of s-wave superconductivity can be conventional due to electron-phonon coupling or unconventional due to spin fluctuations. We analyze the hexagonal diboride CrB$_2$, which is an itinerant antiferromagnet at ambient conditions and turns superconducting upon increasing pressure. While the high pressure behavior of T$_c$ suggests conventional s-wave pairing, we find that spin fluctuations promoting unconventional s-wave pairing become important in the vicinity of the antiferromagnetic dome. As the symmetry class of the s-wave state is independent of its underlying mechanism, we argue that CrB$_2$ is a realization of a hybrid s-wave superconductor where unconventional and conventional s-wave mechanisms team up to form a joint superconducting dome.
