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DOE OSTI · 2419511

Phonon Anharmonicity and Spin–Phonon Coupling in CrI 3

Tomarchio, Luca·Mosesso, Lorenzo·Macis, Salvatore·Nguyen, Loi T.·Grilli, Antonio·Romani, Martina·Guidi, Mariangela Cestelli·Cava, Robert J.·Lupi, Stefano
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Abstract

We report on the far-infrared, temperature-dependent optical properties of a CrI 3 transition metal halide single crystal, a van der Waals ferromagnet (FM) with a Curie temperature of 61 K. In addition to the expected phonon modes determined by the crystalline symmetry, the optical reflectance and transmittance spectra of CrI 3 single crystals show many other excitations as a function of temperature as a consequence of the combination of a strong lattice anharmonicity and spin–phonon coupling. This complex vibrational spectrum highlights the presence of entangled interactions among the different degrees of freedom in CrI 3 .

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36 MATERIALS SCIENCEChemistryMaterials ScienceMetallurgy & Metallurgical EngineeringPhysicsoptical spectroscopyphonon anharmonicityspin–phonon couplingvan der Waals ferromagnet

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Tomarchio, Luca, Mosesso, Lorenzo, Macis, Salvatore, Nguyen, Loi T., Grilli, Antonio, Romani, Martina, Guidi, Mariangela Cestelli, Cava, Robert J., Lupi, Stefano. 2023-07-09. Phonon Anharmonicity and Spin–Phonon Coupling in CrI 3. https://doi.org/10.3390/ma16144909

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