Suppression of magnetic ordering in XXZ-type antiferromagnetic monolayer NiPS3

Abstract

How a certain ground state of complex physical systems emerges, especially in two-dimensional materials, is a fundamental question in condensed-matter physics. A particularly interesting case is systems belonging to the class of XY Hamiltonian where the magnetic order parameter of conventional nature is unstable in two-dimensional materials leading to a Berezinskii-Kosterlitz-Thouless transition. Here, we report how the XXZ-type antiferromagnetic order of a magnetic van der Waals material, NiPS3, behaves upon reducing the thickness and ultimately becomes unstable in the monolayer limit. Our experimental data are consistent with the findings based on renormalization group theory that at low temperatures a two-dimensional XXZ system behaves like a two-dimensional XY one, which cannot have a long-range order at finite temperatures. This work provides experimental examination of the XY magnetism in the atomically thin limit and opens new opportunities of exploiting these fundamental theorems of magnetism using magnetic van der Waals materials.

57 pages, 24 figures (including Supplementary Information)

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Cited by in corpus (8)

• Antiferromagnetic ordering in van der Waals two-dimensional magnetic material MnPS3 probed by Raman spectroscopy
• Tuning Inelastic Light Scattering via Symmetry Control in 2D Magnet CrI${}_3$
• Magnetic order induced polarization anomaly of Raman scattering in 2D magnet CrI${}_3$
• Optically driven ultrafast magnetic order transitions in two-dimensional ferrimagnets
• Quasi-2D magnetic correlations in Ni${}_2$P${}_2$S${}_6$ probed by ${}^{31}$P NMR
• Large interfacial spin-orbit torques in layered antiferromagnetic insulator NiPS${}_3$/ferromagnet bilayers
• Dimensional Crossover Tuned by Pressure in Layered Magnetic NiPS3
• Quantum tunneling devices incorporating two-dimensional magnetic semiconductors