Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 141, Issue 13, Pages 5326-5333Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b13584
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Funding
- National Key R&D Program of China [2015CB921400, 2016YFA0300504, 2017YFA0302903]
- National Natural Science Foundation of China [11574394, 11774423, 11774424, 11822412]
- Fundamental Research Funds for the Central Universities
- Research Funds of Renmin University of China [15XNLF07, 18XNLG14, 19XNLG17]
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We report structural properties, physical properties, and the electronic structure of van der Waals (vdW) crystal VI3. Detailed analysis reveals that VI3 exhibits a structural transition from monoclinic C2/m to rhombohedral R (3 ) over bar at T-s approximate to 79 K, similar to CrX3 (X = Cl, Br, I). Below T-s, a long-range ferromagnetic (FM) transition emerges at T-c approximate to SO K. The local moment of V in VI3 is close to the high-spin state V3+ ion (S = 1). Theoretical calculations suggest that VI3 may be a Mott insulator with a band gap of about 0.90 eV. In addition, VI3 has a relatively small interlayer binding energy and can be exfoliated easily down to a few layers experimentally. Therefore, VI3 is a candidate for two-dimensional FM semiconductors. It also provides a novel platform to explore 2D magnetism and vdW heterostructures in S = 1 system.
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