CrI₃中的声子非简谐性与自旋-声子耦合

Phonon Anharmonicity and Spin-Phonon Coupling in CrI.

作者信息

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

机构信息

Department of Physics, Sapienza University, Piazzale Aldo Moro 5, 00185 Rome, Italy.

INFN Section of Rome, P.Le Aldo Moro, 2, 00185 Rome, Italy.

出版信息

Materials (Basel). 2023 Jul 9;16(14):4909. doi: 10.3390/ma16144909.

DOI:10.3390/ma16144909

PMID:37512184

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10381855/

Abstract

We report on the far-infrared, temperature-dependent optical properties of a CrI3 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 CrI3 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 CrI3.

摘要

我们报道了CrI₃过渡金属卤化物单晶的远红外、温度相关光学性质，该单晶是一种居里温度为61 K的范德华铁磁体（FM）。除了由晶体对称性决定的预期声子模式外，CrI₃单晶的光反射率和透射率光谱还显示出许多其他随温度变化的激发，这是强晶格非谐性和自旋 - 声子耦合共同作用的结果。这种复杂的振动光谱突出了CrI₃中不同自由度之间存在纠缠相互作用。