Probing quasi-long-range ordering by magnetostriction in monolayer CoPS3

Abstract

Mermin-Wagner-Coleman theorem predicts no long-range magnetic order at finite temperature in the two-dimensional (2D) isotropic systems, but a quasi-long-range order with a divergent correlation length at the Kosterlitz-Thouless (KT) transition for planar magnets. As a representative of two-dimensional planar antiferromagnets, single-layer CoPS3 carries the promise of monolayer antiferromagnetic platforms for the ultimately thin spintronics. Here, with the aid of magnetostriction which is sensitive to the local magnetic order, we observe the signatured phonon mode splitting of below TKT in monolayer CoPS3, revealing the presence of quasi-long-range ordering in XY-type antiferromagnet. Moreover, the ratio (J'/J) between the interlayer and intralayer interactions, which characterizes the 2D behaviors, is evaluated to be around 0.03 for the first time. Our results provide an efficient method to detect the quasi-long-range antiferromagnetic ordering in the two-dimensional magnets down to monolayer limit.

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Cited by in corpus (8)

• Intrinsic ferromagnetism and restrictive thermodynamic stability in MA${}_2$N${}_4$ and Janus VSiGeN${}_4$ monolayers
• Pressure-Induced Insulator-to-Metal Transition in van der Waals compound CoPS${}_3$
• Ultrafast laser-induced spin-lattice dynamics in the van der Waals antiferromagnet CoPS3
• Superexchange interactions and magnetic anisotropy in MnPSe${}_3$ monolayer
• Long-lived Zone-boundary Magnons in an Antiferromagnet
• Layered Topological Antiferromagnetic Metal at Room Temperature -- YbMn${}_2$Ge${}_2$
• Emergence of Meron Kekulé lattices in twisted Néel antiferromagnets
• Large-Gap Quantum Anomalous Hall Effect in Monolayer Halide Perovskite