High pressure tuning of magnon-polarons in the layered antiferromagnet FePS${}_3$

Abstract

Magnetic layered materials have emerged recently as promising systems to introduce magnetism in structures based on two-dimensional (2D) materials and to investigate exotic magnetic ground states in the 2D limit. In this work, we apply high hydrostatic pressures up to P = 8.7 GPa to the bulk layered antiferromagnet FePS${}_3$ to tune the collective lattice excitations (phonons) in resonance with magnetic excitations (magnons). Close to P = 4 GPa, the magnon-phonon resonance is achieved and the strong coupling between these collective modes leads to the formation of new quasi-particles, the magnon-polarons, evidenced in our low temperature Raman scattering experiments by a particular avoided crossing behavior between the phonon and the doubly degenerate antiferromagnetic magnon. At the pressure-induced magnon-phonon resonance, three distinct coupled modes emerge. As it is mainly defined by intralayer properties, we show that the energy of the magnon is nearly pressure independent. We additionally apply high magnetic fields up to B = 30 T to fully identify and characterize the magnon excitations, and to explore the different magnon-polaron regimes for which the phonon has an energy lower-, equal to-, or higher- than the magnon energy. The description of our experimental data requires introducing a phonon-phonon coupling not taken into account in actual calculations.

11 pages + 6 pages of supplementary materials

References in corpus (9)

• Ising-Type Magnetic Ordering in Atomically Thin FePS3
• Magnon Polarons in the Spin Seebeck Effect
• Direct observation of magnon-phonon coupling in yttrium iron garnet
• Magnon-polarons in van der Waals antiferromagnet FePS3
• Evolution of magnetic order in van-der-Waals antiferromagnet FePS${}_3$ through insulator-metal transition
• Evidence for biquadratic exchange in the quasi-two-dimensional antiferromagnet FePS${}_3$
• Magnon-polaron excitations in the noncollinear antiferromagnet Mn${}_3$Ge
• Raman and first-principles study of the pressure induced Mott-insulator to metal transition in bulk FePS${}_3$
• Spatially resolved optical spectroscopy in extreme environment of low temperature, high magnetic fields and high pressure

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