CeTe₃ is a unique platform to investigate the itinerant magnetism in a van der Waals (vdW) coupled metal. Despite chemical pressure being a promising route to boost quantum fluctuation in this system, a systematic study on the chemical pressure effect on Ce³⁺(4f¹) states is absent. Here, we report on the successful growth of a series of Se doped single crystals of CeTe₃. We found a fluctuation driven exotic magnetic rotation from the usual easy-axis ordering to an unusual hard-axis ordering. Unlike in localized magnetic systems, near-critical magnetism can increase itinerancy hand-in-hand with enhancing fluctuation of magnetism. Thus, seemingly unstable hard-axis ordering emerges through kinetic energy gain, with the self-consistent observation of enhanced magnetic fluctuation (disorder). As far as we recognize, this order-by-disorder process in fermionic system is observed for the first time within vdW materials. Our finding opens a unique experimental platform for direct visualization of the rich quasiparticle Fermi surface deformation associated with the Fermionic order-by-disorder process. Also, the search for emergent exotic phases by further tuning of quantum fluctuation is suggested as a promising future challenge.

CeTe ₃是一个独特的平台，用于研究范德华 (vdW) 耦合金属中的流动磁性。尽管化学压力是促进该系统中量子涨落的有前途的途径，但缺乏关于化学压力对 Ce ³⁺ (4 f ^{1 ) 态的影响的系统研究。}在这里，我们报告了一系列 CeTe _{3掺杂 Se 单晶的成功生长}. 我们发现了一种波动驱动的奇异磁旋转，从通常的易轴排序到不寻常的硬轴排序。与局部磁系统不同，近临界磁力可以随着磁力波动的增加而增加行程。因此，通过动能增益出现看似不稳定的硬轴有序，并观察到增强的磁波动（无序）。据我们所知，在 vdW 材料中首次观察到费米子系统中的这种有序过程。我们的发现打开了一个独特的实验平台，可以直接可视化与费米子有序过程相关的丰富准粒子费米表面变形。还，