压力调节双穹超级导体在KZnBi中的蜂窝晶格
Pressure-tuned double-dome superconductivity in KZnBi with honeycomb lattice
AI总结：
研究发现KZnBi在压力下表现出M形双穹超导相，Tc在约2.5 GPa时达到7 K，并在进一步压缩下出现更高Tc的重新进入超导相。
摘要：
具有蜂窝晶格结构的材料表现出独特的电子性质，这源于其独特的原子排列。其弱耦合性质使材料能够通过外部刺激进行调节，从而导致多种物理现象，特别是超导性。在此，我们报告了在KZnBi中发现的压力诱导M形双穹超导相。在施加压力下，超导转变温度Tc急剧上升，并在约2.5 GPa时达到最大值7 K。在从常压P63/mmc相转变为高压Pnma相的结构相变后，Tc逐渐下降。进一步压缩导致在约7 GPa处的电子转变，伴随着一个意外的重新进入超导相，其Tc为8 K。我们的理论计算表明，KZnBi在结构相变后从狄拉克能带结构转变为强拓扑半金属状态。这些发现使KZnBi成为研究蜂窝晶格多样结构表现和内在现象的理想平台，展示了蜂窝结构在推进超导研究中的基础重要性。
英文摘要：
Materials with honeycomb lattice structures exhibit unique electronic properties arising from their distinctive atomic arrangements. Their weakly coupled nature facilitates modulation by external stimuli, which leads to a diverse range of physical phenomena, particularly superconductivity. Here, we report the discovery of a pressure-induced M-shaped double-dome superconducting phase in KZnBi with honeycomb lattice. Under applied pressure, the superconducting transition temperature Tc increases sharply and reaches a maximum value of 7 K at approximately 2.5 GPa. Following a structural phase transition from the ambient-pressure P63/mmc phase to the high-pressure Pnma phase, Tc gradually decreases. Further compression induces an electronic transition near 7 GPa, accompanied by an unexpected reentrant superconducting phase with a higher Tc of 8 K. Our theoretical calculations indicate that KZnBi undergoes a transition from a Dirac band structure to a strong topological semimetal state following the structural phase transition. These findings establish KZnBi as an ideal platform for investigating the diverse structural manifestations and intrinsic phenomena of the honeycomb lattice, demonstrating the fundamental importance of honeycomb structures in advancing superconductivity research.
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