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Title: Evidence of Spin Frustration in a Vanadium Diselenide Monolayer Magnet
Authors: Wong, PKJ 
Zhang, W 
Bussolotti, F
Yin, X 
Herng, TS 
Zhang, L 
Huang, YL
Vinai, G
Krishnamurthi, S:
Bukhvalov, DW
Zheng, YJ 
Chua, R 
N'Diaye, AT
Morton, SA
Yang, CY
Ou Yang, KH
Torelli, P
Chen, W 
Goh, KEJ 
Ding, J 
Lin, MT
Brocks, G
de Jong, MP
Castro Neto, AH 
Wee, ATS 
Keywords: 2D materials
monolayer magnet
spin frustration
van der Waals epitaxy
vanadium diselenide
Issue Date: 1-Jan-2019
Publisher: Wiley
Citation: Wong, PKJ, Zhang, W, Bussolotti, F, Yin, X, Herng, TS, Zhang, L, Huang, YL, Vinai, G, Krishnamurthi, S:, Bukhvalov, DW, Zheng, YJ, Chua, R, N'Diaye, AT, Morton, SA, Yang, CY, Ou Yang, KH, Torelli, P, Chen, W, Goh, KEJ, Ding, J, Lin, MT, Brocks, G, de Jong, MP, Castro Neto, AH, Wee, ATS (2019-01-01). Evidence of Spin Frustration in a Vanadium Diselenide Monolayer Magnet. Advanced Materials : e1901185-. ScholarBank@NUS Repository.
Abstract: © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Monolayer VSe 2 , featuring both charge density wave and magnetism phenomena, represents a unique van der Waals magnet in the family of metallic 2D transition-metal dichalcogenides (2D-TMDs). Herein, by means of in situ microscopy and spectroscopic techniques, including scanning tunneling microscopy/spectroscopy, synchrotron X-ray and angle-resolved photoemission, and X-ray absorption, direct spectroscopic signatures are established, that identify the metallic 1T-phase and vanadium 3d 1 electronic configuration in monolayer VSe 2 grown on graphite by molecular-beam epitaxy. Element-specific X-ray magnetic circular dichroism, complemented with magnetic susceptibility measurements, further reveals monolayer VSe 2 as a frustrated magnet, with its spins exhibiting subtle correlations, albeit in the absence of a long-range magnetic order down to 2 K and up to a 7 T magnetic field. This observation is attributed to the relative stability of the ferromagnetic and antiferromagnetic ground states, arising from its atomic-scale structural features, such as rotational disorders and edges. The results of this study extend the current understanding of metallic 2D-TMDs in the search for exotic low-dimensional quantum phenomena, and stimulate further theoretical and experimental studies on van der Waals monolayer magnets.
Source Title: Advanced Materials
ISSN: 0935-9648
DOI: 10.1002/adma.201901185
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