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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
Published on: July 18, 2025
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Ferromagnetic van der Waals Crystal VI3.
Shangjie Tian1, Jian-Feng Zhang1, Chenghe Li1
1Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices , Renmin University of China , Beijing 100872 , P. R. China.
Journal of the American Chemical Society
|March 12, 2019
Summary
Vanadium triiodide (VI3) crystals show a structural transition at 79 K and become ferromagnetic below 50 K. This van der Waals material is a promising candidate for two-dimensional ferromagnetic semiconductors.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- Van der Waals (vdW) crystals are crucial for exploring novel electronic and magnetic properties.
- Understanding the interplay between structure, magnetism, and electronic behavior in vdW materials is key for technological advancements.
Purpose of the Study:
- To investigate the structural, physical, and electronic properties of the vdW crystal VI3.
- To determine the potential of VI3 as a two-dimensional (2D) ferromagnetic semiconductor.
Main Methods:
- Experimental characterization of structural and physical properties.
- Theoretical calculations to determine electronic structure and band gap.
- Analysis of magnetic transitions and local moment behavior.
Main Results:
- VI3 exhibits a structural transition from monoclinic to rhombohedral at approximately 79 K.
- A long-range ferromagnetic transition occurs below 50 K, with V moments near the high-spin V3+ state (S=1).
- Theoretical calculations suggest VI3 is a Mott insulator with a 0.90 eV band gap and possesses low interlayer binding energy, enabling exfoliation.
Conclusions:
- VI3 is a promising candidate for 2D ferromagnetic semiconductors due to its structural and magnetic properties.
- It offers a new platform for studying 2D magnetism and vdW heterostructures in S=1 systems.
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