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Raman signatures of spin-phonon coupling in a self-intercalated van der Waals magnet Mn3Si2Te6
Kwon Chang Il,Kim Kwangrae,Kim So Young,Susilo Resta A.,Kang Beomtak,Kim Kyoo,Kim Duck Young,Kim Jonghwan,Kim B.J.,Kim Jun Sung 한국물리학회 2023 Current Applied Physics Vol.53 No.-
We report the results of Raman spectroscopy on a self-intercalated van der Waals ferrimagnet Mn3Si2Te6. Using polarization-resolved Raman spectroscopy, we identify twelve phonon modes with Eg and A1g symmetries, in agreement with the first principle calculations. Below the ferrimagnetic transition temperature Tc ∼ 78 K, we observed a significant deviation of the phonon frequency from the anharmonic model, accompanied by a strong line broadening, indicating a substantial spin-phonon coupling in Mn3Si2Te6. Among twelve phonon modes, this spin-phonon coupling is found to be strong mostly in the out-of-plane vibrational modes. These results highlight the dominant role of the interlayer superexchange interaction in determining the magnetic properties, reflecting the self-intercalated van der Waals structure of Mn3Si2Te6.