Okuma R, Ueta D, Kuniyoshi S, Fujisawa Y, Smith B, Hsu C H, Inagaki Y, Si W, Kawae T, Lin H, Chuang F C, Masuda T, Kobayashi R, Okada Y
Quantum Materials Science Unit, Okinawa Institute of Science and Technology (OIST), Onna, Okinawa, 904-0495, Japan.
Faculty of Science, University of the Ryukyus, Nishihara, Okinawa, 903-0213, Japan.
Sci Rep. 2020 Sep 17;10(1):15311. doi: 10.1038/s41598-020-72300-3.
CeTe 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 Ce(4f) states is absent. Here, we report on the successful growth of a series of Se doped single crystals of CeTe. 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是研究范德华（vdW）耦合金属中巡游磁性的独特平台。尽管化学压力是增强该系统中量子涨落的一条有前景的途径，但目前缺乏对Ce（4f）态化学压力效应的系统研究。在此，我们报告了一系列硒掺杂的CeTe单晶的成功生长。我们发现了一种由涨落驱动的奇异磁旋转，从通常的易轴有序转变为不寻常的硬轴有序。与局域磁系统不同，近临界磁性可以与磁涨落增强同步增加巡游性。因此，看似不稳定的硬轴有序通过动能增益出现，同时自洽地观察到磁涨落（无序）增强。据我们所知，在vdW材料中首次在费米子系统中观察到这种由无序导致有序的过程。我们的发现为直接可视化与费米子无序导致有序过程相关的丰富准粒子费米面变形开辟了一个独特的实验平台。此外，通过进一步调节量子涨落来寻找新兴的奇异相被认为是一个有前景的未来挑战。
