论文标题
中间订购对Kagome超导体CSV的费米表面的影响
The effect of the interlayer ordering on the Fermi surface of Kagome superconductor CsV$_3$Sb$_5$ revealed by quantum oscillations
论文作者
论文摘要
非常规超导性和电荷密度波（CDW）之间的联系吸引了冷凝物质社区，并发现了最近发现的最近发现的AV $ _3 $ _3 $ SB $ _5 $的超导kagome家族（a = k，cs，rb）。 Xray diffraction and Raman spectroscopy measurements established that the CDW order in CsV$_3$Sb$_5$ comprises of a 2x2x4 structure with stacking of layers of star-of-David (SD) and inverse-star-of-David (ISD) pattern along the $c$-axis direction.这种层中排序将引起电子基态的广泛归一化。但是，在费米表面测量中尚未观察到它。在这里，我们报告了使用隧道二极管振荡器频率测量的CSV $ _3 $ SB $ _5 $的量子振荡。我们观察到大量频率，其中许多没有报告。当仅考虑SD或ISD失真时，无法通过DFT计算来解释频率的数量。取而代之的是，我们的结果与计算订购时的计算相一致，并提供了有力的证据，表明CSV $ _3 $ _3 $ sb $ _5 $的CDW阶段具有复杂的结构失真，这反过来又对Fermi表面属性产生了巨大影响。
The connection between unconventional superconductivity and charge density waves (CDW) has intrigued the condensed matter community and found much interest in the recently discovered superconducting Kagome family of AV$_3$Sb$_5$ (A = K, Cs, Rb). Xray diffraction and Raman spectroscopy measurements established that the CDW order in CsV$_3$Sb$_5$ comprises of a 2x2x4 structure with stacking of layers of star-of-David (SD) and inverse-star-of-David (ISD) pattern along the $c$-axis direction. Such interlayer ordering will induce a vast normalization of the electronic ground state; however, it has not been observed in Fermi surface measurements. Here we report quantum oscillations of CsV$_3$Sb$_5$ using tunnel diode oscillator frequency measurements. We observed a large number of frequencies, many of which were not reported. The number of frequencies can not be explained by DFT calculations when only SD or ISD distortion is considered. Instead, our results are consistent with calculations when interlayer ordering is taken into account, providing strong evidence that CDW phase of CsV$_3$Sb$_5$ has complicated structure distortion which in turn has dramatic effects on the Fermi surface properties.
