在非平凡 $\mathcal{Z}_2$ 近似准晶中观测到超导电性
Observation of superconductivity in a nontrivial $\mathcal{Z}_2$ approximant quasicrystal
AI总结：
本文报道在十重准晶 Al$_{13}$Os$_{4}$ 的单斜近似相中发现超导电性，临界温度约5.47 K，并结合电子结构分析揭示其非平凡拓扑和范霍夫奇点，为准晶中非常规超导研究提供了新平台。
摘要：
超导电性和非平凡拓扑是量子材料中备受追求的现象。尽管许多拓扑晶体材料已被发现具有超导电性，但它们在准晶——一类具有独特非周期但有序结构的材料——中的存在仍未得到充分探索。本工作报道了在十重准晶 Al$_{13}$Os$_{4}$ 的单斜近似相中发现超导电性，该材料表现出高超导转变温度和非平凡电子结构。电阻率、磁化强度、比热和 $μ$SR 测量证实了超导电性，临界温度约为 $\sim5.47$ K。详细的电子结构和对称性分析揭示了 $\mathcal{Z}_{2}=1$ 的非平凡态以及自旋极化的导电表面态。重要的是，我们在费米能级处识别出具有显著平坦能量色散的三维鞍点范霍夫奇点，这可以增强超导电性。我们的结果凸显了 Al$_{13}$Os$_{4}$ 中超导电性与非平凡电子态之间丰富的相互作用，表明它是探索准晶材料中非常规超导态的独特平台。
英文摘要：
Superconductivity and nontrivial topology are highly sought-after phenomena in quantum materials. While many topological crystalline materials have been found to exhibit superconductivity, their presence in quasicrystals - materials with a unique aperiodic yet ordered structure - has remained largely unexplored. In this work, we report the discovery of superconductivity in a monoclinic approximant to the decagonal quasicrystal Al$_{13}$Os$_{4}$, that exhibits a high superconducting transition temperature and a nontrivial electronic structure. The resistivity, magnetization, specific heat, and $μ$SR measurements confirm superconductivity with a critical temperature of $\sim5.47$ K. Detailed electronic structure and symmetry analysis reveal nontrivial state with $\mathcal{Z}_{2}=1$ and spin-polarized conducting surface states. Importantly, we identify three-dimensional saddle point van Hove singularities with substantial flat energy dispersion at the Fermi level, which can enhance superconductivity. Our results highlight a rich interplay between superconductivity and nontrivial electronic states in Al$_{13}$Os$_{4}$, demonstrating it as a unique platform for exploring unconventional superconducting states in quasicrystalline materials.
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