High-Pressure Tuning of Magnon-Polarons in the Layered Antiferromagnet FePS3

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...

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Published in:ACS nano Vol. 16; no. 8; pp. 12656 - 12665
Main Authors: Pawbake, Amit, Pelini, Thomas, Delhomme, Alex, Romanin, Davide, Vaclavkova, Diana, Martinez, Gerard, Calandra, Matteo, Measson, Marie-Aude, Veis, Martin, Potemski, Marek, Orlita, Milan, Faugeras, Clement
Format: Journal Article
Language:English
Published: American Chemical Society 23.08.2022
Subjects:
Condensed Matter
Disordered Systems and Neural Networks
Materials Science
Physics
van der Waals materials
optical spectroscopy
extreme conditions
Raman scattering
magnetic materials
ISSN:1936-0851, 1936-086X, 1936-086X
Online Access:Get full text
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Summary: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 FePS3 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 quasiparticles, 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 than, 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.
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ISSN:1936-0851
1936-086X
1936-086X
DOI:10.1021/acsnano.2c04286