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.

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• Spontaneous skyrmionic lattice from anisotropic symmetric exchange in a Ni-halide monolayer
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• Tunable Ferromagnetism and Thermally Induced Spin Flip in Vanadium-doped Tungsten Diselenide Monolayers at Room Temperature
• Ferromagnetism in 2D Vanadium Diselenide
• In-plane magnetic domains and Néel-like domain walls in thin flakes of the room temperature CrTe${}_2$ van der Waals ferromagnet
• Magnetic Transition in Monolayer VSe2 via Interface Hybridization
• Evidence for metallic 1T phase, 3d1 electronic configuration and charge density wave order in molecular-beam epitaxy grown monolayer VTe2
• Intrinsic 2D Ferromagnetism in V5Se8 Epitaxial Thin Films
• Pressure-induced suppression of charge density wave and emergence of Superconductivity in 1T-VSe2
• Characterization of room-temperature in-plane magnetization in thin flakes of CrTe${}_2$ with a single spin magnetometer
• Theory and simulations of critical temperatures in CrI3 and other 2D materials: Easy-axis magnetic order and easy-plane Kosterlitz-Thouless transitions
• Structural phase transitions in VSe2: energetics, electronic structure and magnetism
• Electronic and Magnetic Characterization of Epitaxial VSe${}_2$ Monolayers on Superconducting NbSe${}_2$
• Ab initio calculation of the effective Coulomb interactions in MX2 (M=Ti, V, Cr, Mn, Fe, Co, Ni; X=S, Se, Te): intrinsic magnetic ordering and Mott insulating phase
• Proximity-induced ferromagnetism and chemical reactivity in few layers VSe2 heterostructures
• Confinement-engineered superconductor to correlated-insulator transition in a van der Waals monolayer
• Coexisting charge-ordered states with distinct driving mechanisms in monolayer VSe${}_2$
• Ultrafast triggering of insulator-metal transition in two-dimensional VSe${}_2$
• Novel 2D vanadium sulphides: synthesis, atomic structure engineering and charge density waves
• Controllable phase transitions between multiple charge density waves in monolayer 1T-VSe${}_2$ via doping and strain engineering
• Atomically sharp 1D interfaces in 2D lateral heterostructures of VSe${}_2$-NbSe${}_2$ monolayers
• Spectroscopic evidence of high temperature superconductivity in VSe2
• Identification of a Low Energy Metastable 1$T$-Type Phase for Monolayer VSe2
• Alloying 2D VSe2 with Pt: from a charge density wave state to a disordered insulator
• Magnetic anisotropy and magnetic ordering of transition-metal phosphorus trisulfides
• A full gap above the Fermi level: the charge density wave of monolayer VS2
• Electronic structure and charge-density wave transition in monolayer VS_{2}