标题： 穹顶状超导相图与LaRu$_{3}$Si$_{2}$中电荷秩序相关 显示英文标题

标题： Dome-Shaped Superconducting Phase Diagram Linked to Charge Order in LaRu$_{3}$Si$_{2}$

摘要： 超导性和电荷秩序之间的相互作用是凝聚态研究的核心焦点，石墨烯晶格系统提供了独特的见解。 kagome超导体LaRu$_{3}$Si$_{2}$($T_{\rm c}$ ${\simeq}$ 6.5 K)表现出电荷序相变的层次结构：主要相变($T_{\rm co,I}$ ${\simeq}$ 400 K)，次级相变($T_{\rm co,II}$ ${\simeq}$ 80 K)，以及在($T^{*}$ $\simeq$ 35 K)处的额外相变。 在$T_{\rm co,II}$和$T^{*}$处的转变通过μ子自旋旋转和磁输运实验揭示了与电子和磁响应的关系。 然而，超导性、电荷序和电子响应之间的联系仍然难以捉摸。 通过在高达40 GPa的压力下使用磁输运和X射线衍射技术，我们观察到$T_{\rm c}$在2 GPa时上升至9 K，在12 GPa之前几乎保持不变，然后在40 GPa时下降至2 K，导致一个穹顶状相图。 在$T^{*}$处的电阻率异常和磁阻也表现出类似的穹顶状压力依赖性。 此外，我们发现电荷序在12 GPa以上从长程转变为短程，与$T_{\rm c}$的抑制相关，这表明超导性与电荷有序态密切相关。 具体而言，当电荷序和正常态的电子响应优化时，$T_{\rm c}$达到峰值。 与铜氧化物、过渡金属二硫化物和其他kagome材料等系统不同，其中超导性通常与电荷序竞争，LaRu$_{3}$Si$_{2}$表现出这两种现象之间明显的相互依赖性。 这种独特行为为超导性和电荷序之间的联系提供了新的见解，为理解超导性的理论进展提供了途径。 显示英文摘要

摘要： The interplay between superconductivity and charge order is a central focus in condensed matter research, with kagome lattice systems offering unique insights. The kagome superconductor LaRu$_{3}$Si$_{2}$ ($T_{\rm c}$ ${\simeq}$ 6.5 K) exhibits a hierarchy of charge order transitions: primary ($T_{\rm co,I}$ ${\simeq}$ 400 K), secondary ($T_{\rm co,II}$ ${\simeq}$ 80 K), and an additional transition at ($T^{*}$ $\simeq$ 35 K). The transitions at $T_{\rm co,II}$ and $T^{*}$ are linked to electronic and magnetic responses as revealed by muon-spin rotation and magnetotransport experiments. However, the connection between superconductivity, charge order, and electronic responses has remained elusive. By employing magnetotransport and X-ray diffraction techniques under pressures of up to 40 GPa, we observe that $T_{\rm c}$ rises to 9 K at 2 GPa, remains nearly constant up to 12 GPa, and then decreases to 2 K at 40 GPa, resulting in a dome-shaped phase diagram. The resistivity anomaly at $T^{*}$ and magnetoresistance also exhibit a similar dome-shaped pressure dependence. Furthermore, we find that charge order transitions from long-range to short-range above 12 GPa, correlating with the suppression of $T_{\rm c}$, suggesting superconductivity is closely tied to the charge-ordered state. Specifically, $T_{\rm c}$ peaks when charge order and the normal-state electronic responses are optimized. In contrast to systems like the cuprates, transition metal dichalcogenides, and other kagome materials, where superconductivity typically competes with charge order, LaRu$_{3}$Si$_{2}$ displays a pronounced interdependence between these two phenomena. This distinctive behavior sheds new light on the connection between superconductivity and charge order, offering avenues for theoretical advancements in understanding superconductivity.