Quasi-Two-Dimensional Magnon Identification in Antiferromagnetic FePS3 via Magneto-Raman Spectroscopy

Abstract

Recently it was discovered that van der Waals-bonded magnetic materials retain long range magnetic ordering down to a single layer, opening many avenues in fundamental physics and potential applications of these fascinating materials. One such material is FePS3, a large spin (S=2) Mott insulator where the Fe atoms form a honeycomb lattice. In the bulk, FePS3 has been shown to be a quasi-two-dimensional-Ising antiferromagnet, with additional features in the Raman spectra emerging below the Neel temperature of approximately 120 K. Using magneto-Raman spectroscopy as an optical probe of magnetic structure, we show that one of these Raman-active modes in the magnetically ordered state is actually a magnon with a frequency of of approximately 3.7 THz (122 cm-1). Contrary to previous work, which interpreted this feature as a phonon, our Raman data shows the expected frequency shifting and splitting of the magnon as a function of temperature and magnetic field, respectively, where we determine the g-factor to be approximately 2. In addition, the symmetry behavior of the magnon is studied by polarization-dependent Raman spectroscopy and explained using the magnetic point group of FePS3.

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• Acousto-magnonic spin Hall effect in honeycomb antiferromagnets
• Coherent strong-coupling of terahertz magnons and phonons in a Van der Waals antiferromagnetic insulator
• Spatially resolved optical spectroscopy in extreme environment of low temperature, high magnetic fields and high pressure
• Fluctuating Fractionalized Spins in Quasi Two-dimensional Magnetic V0.85PS3
• Ring-Exchange Interaction Effects on Magnons in Dirac Magnet CoTiO${}_3$
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• Phonon-mediated strong coupling between a three-dimensional topological insulator and a two-dimensional antiferromagnetic material
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• Thermal squeezing and nonlinear spectral shift of magnons in antiferromagnetic insulators
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• Magnetic Order and Magneto-Elasticity in the Electronic Excitations of Gd-$i$-MAX
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