Journal
PHYSICAL REVIEW B
Volume 99, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.041402
Keywords
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Funding
- Jesus College of the University of Cambridge
- IHT Kazatomprom
- CHT Uzbekistan Programme
- Ministry of Education and Science of the Russian Federation [K2-2017-024]
- German research Project [SFB 1238]
- Koln University via the German Excellence Initiative
- van der Waals Materials Research Center [NRF-2017R1A5A1014862]
- Institute for Basic Science of the Republic of Korea [IBS-R009-G1]
- National Research Foundation of Korea [2017R1A5A1014862] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- EPSRC [EP/M000524/1] Funding Source: UKRI
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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 transitionmetal 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 VI(3 )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.
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