论文标题
小公园效应中4HB-TAS2中两个组分订单参数的证据
Evidence of a two-component order parameter in 4Hb-TaS2 in the Little-Parks effect
论文作者
论文摘要
在非常规超导性领域，找到非平凡配对状态的明确证据是最大的实验挑战之一。这些证据要求相敏感的探针易受阶参数的内部结构。我们测量小公园的效果，以提供4HB-TAS $ _2 $中非常规超导订单参数的明确证据。也就是说，我们在由单晶制成的环的过渡温度振荡中找到了$π$换档。我们认为，只有在基础订单参数属于二维表示的情况下，才能发生这种效果，换句话说，在过渡时有两个退化顺序参数。此外，我们表明当应用恒定面板字段时，$ t_c $作为平面外字段的函数增强。这种增加与手性状态一致，这通常仅从两个组分顺序参数中出现。结合以前的实验，我们的结果强烈表明4HB-TAS $ _2 $确实实现了手性超导体。
Finding unambiguous evidence of non-trivial pairing states is one of the greatest experimental challenges in the field of unconventional superconductivity. Such evidence requires phase-sensitive probes susceptible to the internal structure of the order parameter. We measure the Little-Parks effect to provide clear evidence of an unconventional superconducting order parameter in 4Hb-TaS$_2$. Namely, we find a $π$-shift in the transition-temperature oscillations of rings made of a single crystal. We argue that such an effect can only occur if the underlying order parameter belongs to a two-dimensional representation, in other words there are two degenerate order parameters right at the transition. Additionally, we show that $T_c$ is enhanced as a function of the out-of-plane field when a constant in-plane field is applied. Such an increase is consistent with a chiral state, which again, in general only emerges from a two-component order parameter. In combination with previous experiments, our results strongly indicate that 4Hb-TaS$_2$ indeed realizes a chiral superconductor.
