论文标题
在CA $ _ {1-x} $ sr $ _ {x} $ alsi的蜂窝晶格上的两间隙到单间隙超导过渡
Two-gap to Single-gap Superconducting Transition on a Honeycomb Lattice in Ca$_{1-x}$Sr$_{x}$AlSi
论文作者
论文摘要
一个事实是，化合物的物理特性遵循其晶体对称性。这尤其明显对材料中新兴的集体量子状态的影响。具体而言，尽管澄清这种关系是正在进行的研究的核心努力，但晶体对称对超导体性质的影响得到了广泛的理解。蜂窝晶格上的新兴现象具有特别的兴趣，因为它们可以引起壮观的现象学，这表现为魔术角石墨烯中相关状态的最新发现，或者是由MGB $ _2 $中的高温超导性所表现出来的。在这里，我们报告了具有Al/Si Honeycomb层的一类三元超导体的结构和显微镜超导属性，即Ca $ _ {1-x} $ sr $ _ {x} $ alsi。我们表明，这种实心解决方案是一个非凡的模型系统，具有高度可调的两间隙到蜂窝晶格上的单间隙超导系统，在该系统中，超导性通过微妙的结构不稳定性增强，即Al/si层的屈曲。
It is a well-established fact that the physical properties of compounds follow their crystal symmetries. This has especially pronounced implications on emergent collective quantum states in materials. Specifically, the effect of crystal symmetries on the properties of superconductors is widely appreciated, although the clarification of this relationship is a core effort of on-going research. Emergent phenomena on honeycomb lattices are of special interest, as they can give rise to spectacular phenomenology, as manifested by the recent discovery of correlated states in magic-angle graphene, or by the high-temperature superconductivity in MgB$_2$. Here, we report on the structural and microscopic superconducting properties of a class of ternary superconductors with Al/Si honeycomb layers, i.e. Ca$_{1-x}$Sr$_{x}$AlSi. We show that this solid solution is a remarkable model system with a highly tunable two-gap to single-gap superconducting system on a honeycomb lattice, where the superconductivity is enhanced by a subtle structural instability, i.e. the buckling of the Al/Si layers.
