论文标题
t $ _ {cdw} $上方的充电密度波订单和波动，kagome Metal CSV $ _ {3} $ sb $ _ {5} $
Charge density wave order and fluctuations above T$_{CDW}$ and below superconducting T$_c$ in the kagome metal CsV$_{3}$Sb$_{5}$
论文作者
论文摘要
Kagome金属家族\ ch {Av3SB5}（A = K，RB，CS）的相图具有超导性和电荷密度波（CDW）不稳定性，这些稳定性引起了最近的关注。但是，仍然存在重大问题。特别是，尚未对CDW状态的温度演化和灭亡进行广泛的研究，在低温下CDW与超导性的共存知之甚少。我们报告了\ ch {csv3sb5}的X射线散射研究，在从300 k到$ \ sim $ 2 k的广泛温度下，低于其超导性的发作，以$ \ textit {t} _ \ textIt {t} _ \ text _ \ text {c} _ c} \ sim $ 2.9k。依赖性以$ t^*$ $ \ sim $ 160 k的速度出现，远高于与CDW订单相关的易感异常，$ \ textit {t} _ \ text {cdw} = 94 $ k。这意味着强烈的CDW波动与$ \ sim1.7 \ sim1.7 \ sim1.7 \ textit \ textit \ textit \ textit {t}观察到CDW订单参数从$ t = 16 $ k到2 k，这意味着CDW和超导订单在$ \ textit {t} _ \ textiT {c} $下方共存，并且在环境压力下，在$ \ textit pextit pextiT pertect at Pertect at Pertect at Pertecter at Pertecter at Pertecter at Pertecter contrip fextiT {c}晶格参数中的温度依赖性异常与$ \ textit {t} _ \ text {cdw} $ for $ \ textit {c}（t）$以及$ t^*$ for $ a（t）$一致。
The phase diagram of the kagome metal family \ch{AV3Sb5} (A = K, Rb, Cs) features both superconductivity and charge density wave (CDW) instabilities, which have generated tremendous recent attention. Nonetheless, significant questions remain. In particular, the temperature evolution and demise of the CDW state has not been extensively studied, and little is known about the co-existence of the CDW with superconductivity at low temperatures. We report an x-ray scattering study of \ch{CsV3Sb5} over a broad range of temperatures from 300 K to $\sim$ 2 K, below the onset of its superconductivity at $\textit{T}_\text{c}\sim$ 2.9 K. Order parameter measurements of the $2\times2\times2$ CDW structure show an unusual and extended linear temperature dependence onsetting at $T^*$ $\sim$ 160 K, much higher than the susceptibility anomaly associated with CDW order at $\textit{T}_\text{CDW}=94$ K. This implies strong CDW fluctuations exist to $\sim1.7\times\textit{T}_\text{CDW}$. The CDW order parameter is observed to be constant from $T=16$ K to 2 K, implying that the CDW and superconducting order co-exist below $\textit{T}_\text{c}$, and, at ambient pressure, any possible competition between the two order parameters is manifested at temperatures well below $\textit{T}_\text{c}$, if at all. Anomalies in the temperature dependence in the lattice parameters coincide with $\textit{T}_\text{CDW}$ for $\textit{c}(T)$ and with $T^*$ for $a(T)$.
