Limited ferromagnetic interactions in monolayers of MPS${}_3$ (M=Mn, Ni)

Abstract

We present a systematic study of the electronic and magnetic properties of two-dimensional ordered alloys, consisting of two representative hosts (MnPS${}_3$ and NiPS${}_3$) of transition metal phosphorus trichalcogenides doped with $3d$ elements. For both hosts our DFT+U calculations are able to qualitatively reproduce the ratios and signs of all experimentally observed magnetic couplings. The relative strength of all antiferromagnetic exchange couplings, both in MnPS${}_3$ as well as in NiPS${}_3$, can successfully be explained using an effective direct exchange model: they reveal that the third-neighbor exchange dominates in NiPS${}_3$ due to the filling of the $t_{2g}$ subshell, whereas for MnPS${}_3$ the first neighbor exchange is prevailed owing to the presence of the $t_{2g}$ magnetism. On the other hand, the nearest neighbor ferromagnetic coupling in NiPS${}_3$ can only be explained using a more complex superexchange model and is (also) largely triggered by the absence of the $t_{2g}$ magnetism. For the doped systems, the DFT+U calculations revealed that magnetic impurities do not affect the magnetic ordering observed in the pure phases and thus in general in these systems ferromagnetism may not be easily induced by such a kind of elemental doping. However, unlike for the hosts, the first and second (dopant-host) exchange couplings are of similar order of magnitude. This leads to frustration in case of antiferromagnetic coupling and may be one of the reasons of the observed lower magnetic ordering temperature of the doped systems.

15 pages, 8 figures, 3 tables

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• Identifying band structure changes of FePS3 across the antiferromagnetic phase transition
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• Engineering Altermagnetism via Layer Shifts and Spin Order in Bilayer MnPS${}_3$
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• Change in Magnetic Order in NiPS3 Single Crystals Induced by a Molecular Intercalation
• Exciton-spin interactions in antiferromagnetic charge-transfer insulators
• Ground-State Properties of the $t$-$J$ Model for the CuO Double-Chain Structure
• Pressure-induced transitions in FePS${}_3$: Structural, magnetic and electronic properties
• AMaRaNTA: Automated First-Principles Exchange Parameters In 2D Magnets
• Probing the band structure of the strongly correlated antiferromagnet NiPS3 across its phase transition
• Magnetism and magnetoelastic effect in 2D van der Waals multiferroic CuCrP2S6
• Stabilization of zigzag order in NiPS${}_3$ via positive biquadratic interaction
• Van der Waals Antiferromagnets: From Early Discoveries to Future Directions in the 2D Limit
• Strain Modulated Electronic and Optical Properties of Laterally Stitched MoSi2N4/XSi2N4 (X=W, Ti) 2D Heterostructures