Evidence of Spin Frustration in a Vanadium Diselenide Monolayer Magnet

Ping Kwan Johnny Wong, Wen Zhang, Fabio Bussolotti, Xinmao Yin, Tun Seng Herng, Lei Zhang, Yu Li Huang, Giovanni Vinai, Sridevi Krishnamurthi, Danil W. Bukhvalov, Yu Jie Zheng, Rebekah Chua, Alpha T. N'Diaye, Simon A. Morton, Chao Yao Yang, Kui Hon Ou Yang, Piero Torelli, Wei Chen, Kuan Eng Johnson Goh, Jun DingMinn Tsong Lin, Geert Brocks, Michel P. de Jong*, Antonio H. Castro Neto, Andrew Thye Shen Wee

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)

Abstract

Monolayer VSe2, 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 3d1 electronic configuration in monolayer VSe2 grown on graphite by molecular-beam epitaxy. Element-specific X-ray magnetic circular dichroism, complemented with magnetic susceptibility measurements, further reveals monolayer VSe2 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.

Original languageEnglish
Article number1901185
JournalAdvanced materials
Volume31
Issue number23
DOIs
Publication statusPublished - 6 Jun 2019

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Keywords

  • UT-Hybrid-D
  • monolayer magnet
  • spin frustration
  • van der Waals epitaxy
  • vanadium diselenide
  • 2D materials

Cite this

Wong, P. K. J., Zhang, W., Bussolotti, F., Yin, X., Herng, T. S., Zhang, L., ... Wee, A. T. S. (2019). Evidence of Spin Frustration in a Vanadium Diselenide Monolayer Magnet. Advanced materials, 31(23), [1901185]. https://doi.org/10.1002/adma.201901185