Fermionic order by disorder in a van der Waals antiferromagnet
Fermionic order by disorder in a van der Waals antiferromagnet
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DOI：
10.1038/s41598-020-72300-3
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发表时间：
2020-07
影响因子：
4.6
通讯作者：
R. Okuma;D. Ueta;S. Kuniyoshi;Y. Fujisawa;B. Smith;C. Hsu;Yuji Inagaki;W. Si;T. Kawae;Hsin Lin;F. Chuang;Takatsugu Masuda;R. Kobayashi;Y. Okada
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文献类型：
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作者：
R. Okuma;D. Ueta;S. Kuniyoshi;Y. Fujisawa;B. Smith;C. Hsu;Yuji Inagaki;W. Si;T. Kawae;Hsin Lin;F. Chuang;Takatsugu Masuda;R. Kobayashi;Y. Okada
CeTe 3是研究货车范德华（vdW）耦合金属巡游磁性的独特平台。尽管化学压力是一个很有前途的途径，以提高量子涨落在该系统中，化学压力对Ce 3+（4f 1）状态的影响是缺乏系统的研究。在这里，我们报告了一系列的Se掺杂的CeTe 3单晶的成功生长。我们发现了一个波动驱动的奇异磁旋转从通常的易磁化轴有序到一个不寻常的难磁化轴有序。与定域磁系统不同，近临界磁系统在增强磁涨落的同时，也增强了巡游性。因此，看似不稳定的难磁化轴有序出现通过动能增益，与增强的磁波动（无序）的自洽观察。据我们所知，在vdW材料中首次观察到了费米子系统中的这种有序-无序过程。我们的发现打开了一个独特的实验平台，直接可视化丰富的准粒子费米表面变形与费米有序无序过程。此外，通过进一步调整量子涨落来寻找新出现的奇异相位被认为是一个有前途的未来挑战。
CeTe3is 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.