The relationship between charge-density waves (CDWs) and superconductivity is a long-standing debate. Often observed as neighbors in phase diagrams, it is still unclear whether they cooperate, compete, or simply coexist. Using angle-resolved photoemission spectroscopy, we demonstrate here that by tuning the energy position of the van Hove singularity in Pd-doped 2H-TaSe₂, one is able to suppress CDW and enhance superconductivity by more than an order of magnitude. We argue that it is particular fermiology of the material that is responsible for each phenomenon, thus explaining their persistent proximity as phases.

中文翻译：

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将电荷密度波转换为库珀对

电荷密度波（CDW）与超导性之间的关系是一个长期存在的争论。通常在相图中被观察为邻居，但仍不清楚它们是否合作，竞争或简单地共存。使用角度分辨光发射光谱学，我们在这里证明了通过调节Pd掺杂2H-TaSe _2中van Hove奇异点的能量位置，可以抑制CDW并将超导性提高一个数量级以上。我们认为，是每种现象造成的是材料的特殊的射线学，因此解释了它们作为相的持续接近。