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 journalArticlepeer-review


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 languageEnglish (US)
Article number4909
Issue number14
StatePublished - Jul 2023

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • General Materials Science


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


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