Raman scattering signatures of the strong spin-phonon coupling in the bulk magnetic van der Waals material CrSBr

Abstract

Magnetic excitations in layered magnetic materials that can be thinned down the two-dimensional (2D) monolayer limit are of high interest from a fundamental point of view and for applications perspectives. Raman scattering has played a crucial role in exploring the properties of magnetic layered materials and, even-though it is essentially a probe of lattice vibrations, it can reflect magnetic ordering in solids through the spin-phonon interaction or through the observation of magnon excitations. In bulk CrSBr, a layered A type antiferromagnet (AF), we show that the magnetic ordering can be directly observed in the temperature dependence of the Raman scattering response i) through the variations of the scattered intensities, ii) through the activation of new phonon lines reflecting the change of symmetry with the appearance of the additional magnetic periodicity, and iii) through the observation, below the Neel temperature (TN) of second order Raman scattering processes. We additionally show that the three different magnetic phases encountered in CrSBr, including the recently identified low temperature phase, have a particular Raman scattering signature. This work demonstrates that magnetic ordering can be observed directly in the Raman scattering response of bulk CrSBr with in-plane magnetization, and that it can provide a unique insight into the magnetic phases encountered in magnetic layered materials.

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• Resonant Raman Scattering of Few Layers CrBr${}_3$
• Unusual ferromagnetic band evolution and high Curie temperature in monolayer 1T-CrTe2 on bilayer graphene
• Dynamical phase transition in a strongly hybridized phonon-triplon chain
• Van der Waals CrSBr alloys with tunable magnetic and optical properties
• Resonant X-ray spectroscopies on Chromium $3\text{d}$ orbitals in CrSBr
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• Magneto-Excitonic Duality From Monolayer to Trilayer CrSBr
• Magnetodielectric Properties in Two Dimensional Magnetic Insulators
• Crystallographic Orientation-Dependent Magnetotransport in the Layered Antiferromagnet -- CrSBr
• Raman spectroscopy of van der Waals topological magnet GdGaI
• Magnetic field tuning of modulated magnetic orders in CrOCl at the two-dimensional limit