Phonon Anharmonicity and Spin–Phonon Coupling in CrI3

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

doi:10.3390/ma16144909

Phonon Anharmonicity and Spin–Phonon Coupling in CrI₃

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

Research output: Contribution to journal › Article › peer-review

Abstract

We report on the far-infrared, temperature-dependent optical properties of a CrI (Formula presented.) 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 (Formula presented.) 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 (Formula presented.).

Original language	English (US)
Article number	4909
Journal	Materials
Volume	16
Issue number	14
DOIs	https://doi.org/10.3390/ma16144909
State	Published - Jul 2023

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
General Materials Science

Keywords

optical spectroscopy
phonon anharmonicity
spin–phonon coupling
van der Waals ferromagnet

Access to Document

10.3390/ma16144909

Cite this

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title = "Phonon Anharmonicity and Spin–Phonon Coupling in CrI3",

abstract = "We report on the far-infrared, temperature-dependent optical properties of a CrI (Formula presented.) 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 (Formula presented.) 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 (Formula presented.).",

keywords = "optical spectroscopy, phonon anharmonicity, spin–phonon coupling, van der Waals ferromagnet",

author = "Luca Tomarchio and Lorenzo Mosesso and Salvatore Macis and Nguyen, {Loi T.} and Antonio Grilli and Martina Romani and {Cestelli Guidi}, Mariangela and Cava, {Robert J.} and Stefano Lupi",

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doi = "10.3390/ma16144909",

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journal = "Materials",

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TY - JOUR

T1 - Phonon Anharmonicity and Spin–Phonon Coupling in CrI3

AU - Tomarchio, Luca

AU - Mosesso, Lorenzo

AU - Macis, Salvatore

AU - Nguyen, Loi T.

AU - Grilli, Antonio

AU - Romani, Martina

AU - Cestelli Guidi, Mariangela

AU - Cava, Robert J.

AU - Lupi, Stefano

PY - 2023/7

Y1 - 2023/7

N2 - We report on the far-infrared, temperature-dependent optical properties of a CrI (Formula presented.) 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 (Formula presented.) 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 (Formula presented.).

AB - We report on the far-infrared, temperature-dependent optical properties of a CrI (Formula presented.) 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 (Formula presented.) 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 (Formula presented.).

KW - optical spectroscopy

KW - phonon anharmonicity

KW - spin–phonon coupling

KW - van der Waals ferromagnet

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