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Title :Fermionic order by disorder in a van der Waals antiferromagnet
Authors :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.
Issue Date :16-Sep-2020
Abstract :CeTe_3 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^<3+>(4f^1) states is absent. Here, we report on the successful growth of a series of Se doped single crystals of CeTe_3. 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.
URL :https://doi.org/10.1038/s41598-020-72300-3
Type Local :雑誌掲載論文
ISSN :2045-2322
Publisher :Springer Nature
URI :http://hdl.handle.net/20.500.12000/47032
Citation :Scientific Reports Vol.10
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Science)

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