Evidence of Spin Frustration in Vanadium Diselenide Monolayer Magnet
Abstract
Monolayer VSe2, featuring both charge density wave and magnetism phenomena, represents a unique van der Waals magnet in the family of metallic two-dimensional transition-metal dichalcogenides (2D-TMDs). Herein, by means of in-situ microscopic 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.
Keywords
Cite
@article{arxiv.2206.02427,
title = {Evidence of Spin Frustration in Vanadium Diselenide Monolayer Magnet},
author = {Ping Kwan Johnny Wong and Wen Zhang and Fabio Bussolotti and Xinmao Yin and Tun Seng Herng and Lei Zhang and Yu Li Huang and Giovanni Vinai and Sridevi Krishnamurthi and Danil W Bukhvalov and Yu Jie Zheng and Rebekah Chua and Alpha T N Diaye and Simon A. Morton and Chao-Yao Yang and Kui-Hon Ou Yang and Piero Torelli and Wei Chen and Kuan Eng Johnson Goh and Jun Ding and Minn-Tsong Lin and Geert Brocks and Michel P de Jong and Antonio H Castro Neto and Andrew Thye Shen Wee},
journal= {arXiv preprint arXiv:2206.02427},
year = {2022}
}