journal article·2019-06Open access

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 Ding, Minn‐Tsong Lin, Geert Brocks, Michel P. de Jong, Antonio H. Castro Neto, Andrew Thye Shen Wee

Advanced Materials· Volume 31· Issue 23

Abstract

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.
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Research context

OpenAlex topics: 2D Materials and Applications · Graphene research and applications · MXene and MAX Phase Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Centre for Advanced 2D Materials (CA2DM) and Graphene Research Centre (GRC) National University of Singapore 6 Science Drive 2 Singapore 117546 Singapore

Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore

Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*Star) 2 Fusionopolis Way Innovis Singapore 138634 Singapore

Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore

Instituto Officina dei Materiali (IOM)‐CNR Laboratorio TASC Area Science Park S.S. Km 163.5 Trieste I‐34149 Italy

Computational Materials Science Faculty of Science and Technology and MESA+ Institute for Nanotechnology University of Twente P.O. Box 217 7500 AE Enschede The Netherlands

College of Science Institute of Materials Physics and Chemistry Nanjing Forestry University Nanjing 210037 P. R. China

Institute of Physics and Technology Ural Federal University Mira Street 19 620002 Yekaterinburg Russia

Advanced Light Source (ALS) Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

Department of Physics National Taiwan University Taipei 10617 Taiwan

Department of Chemistry National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore

NanoElectronics Group MESA+ Institute for Nanotechnology University of Twente P.O. Box 217 7500 AE Enschede The Netherlands

Funding

Ministry of Education - Singapore · Office of Science

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