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강상관계 물질 연구단
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Bulk properties of the van der Waals hard ferromagnet VI3

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Title
Bulk properties of the van der Waals hard ferromagnet VI3
Author(s)
Suhan Son; Matthew J. Coak; Nahyun Lee; Jonghyeon Kim; Tae Yun Kim; Hayrullo Hamidov; Hwanbeom Cho; Cheng Liu; David M. Jarvis; Philip A. C. Brown; Jae Hoon Kim; Cheol-Hwan Park; Daniel I. Khomskii; Siddharth S. Saxena; Je-Geun Park
Publication Date
2019-01
Journal
PHYSICAL REVIEW B, v.99, no.4, pp.041402 -
Publisher
AMER PHYSICAL SOC
Abstract
We present comprehensive measurements of the structural, magnetic, and electronic properties of layered van der Waals ferromagnet VI3 down to low temperatures. Despite belonging to a well-studied family of transition-metal trihalides, this material has received very little attention. We outline, from high-resolution powder x-ray diffraction measurements, a corrected room-temperature crystal structure to that previously proposed and uncover a structural transition at 79 K, also seen in the heat capacity. Magnetization measurements confirm VI3 to be a hard ferromagnet (9.1 kOe coercive field at 2 K) with a high degree of anisotropy, and the pressure dependence of the magnetic properties provide evidence for the two-dimensional nature of the magnetic order. Optical and electrical transport measurements show this material to be an insulator with an optical band gap of 0.67 eV - the previous theoretical predictions of d-band metallicity then lead us to believe VI3 to be a correlated Mott insulator. Our latest band-structure calculations support this picture and show good agreement with the experimental data. We suggest VI3 to host great potential in the thriving field of low-dimensional magnetism and functional materials, together with opportunities to study and make use of low-dimensional Mott physics. © 2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/5342
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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