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arXiv 2009.02244cond-mat.supr-con
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蜂窝结构Ca $_{1-x}$ Sr $_{x}$ AlSi中的双能隙到单能隙超导转变

Two-gap to Single-gap Superconducting Transition on a Honeycomb Lattice in Ca$_{1-x}$Sr$_{x}$AlSi

Dorota I. Walicka, Zurab Guguchia, Jorge Lago, Olivier Blacque, KeYuan Ma, Rustem Khasanov, Fabian O. von Rohr

摘要:

化合物的物理性质遵循它们的晶体对称性,这是一个公认的事实。这对材料中涌现的集体量子态有特别明显的影响。具体来说,晶体对称性对超导体性质的影响得到了广泛的重视,尽管澄清这种关系是正在进行的研究的核心工作。蜂窝晶格上的涌现现象特别令人感兴趣,因为它们可以引起壮观的现象学,如最近在魔角石墨烯中发现的相关态,或MgB $_2$中的高温超导性所证明的那样。本文报道了一类具有Al/Si蜂窝层的三元超导体Ca $_{1-x}$ Sr $_{x}$ AlSi的结构和微观超导性质。我们表明,该固溶体是一个显着的模型系统,具有高度可调的双间隙到单间隙超导系统的蜂窝晶格,其中的超导性增强了微妙的结构不稳定性,即屈曲的Al/Si层。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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