Temperature Evolution of Magnon-Polarons in the van der Waals Antiferromagnet FePS₃

@misc{krajewska2026temperature,
  title = {{Temperature Evolution of Magnon-Polarons in the van der Waals Antiferromagnet FePS$_3$}},
  author = {A. Krajewska and J. Kierdaszuk and M. Dub and E. Karpierz-Marczewska and M. Potemski},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.40968},
  eprint = {2610.40968},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.40968},
  note = {CC BY-NC-ND 4.0},
}

TY  - UNPB
TI  - Temperature Evolution of Magnon-Polarons in the van der Waals Antiferromagnet FePS_3
AU  - A. Krajewska
AU  - J. Kierdaszuk
AU  - M. Dub
AU  - E. Karpierz-Marczewska
AU  - M. Potemski
PY  - 2026
DA  - 2026/10/29
PB  - arXiv
DO  - 10.48550/arxiv.2610.40968
UR  - https://arxiv.org/abs/2610.40968
AB  - Magnon polarons, hybrid excitations arising from magnon-phonon coupling, were investigated in the van der Waals antiferromagnet FePS3 using magneto-Raman scattering measurements at temperatures ranging from 4 K to the vicinity of the Néel temperature (T_N = 118 K). The lower Zeeman-split component of the magnon-like mode, tuned by the magnetic field toward the lower-energy phonon mode, exhibits an avoided crossing. The corresponding magnetic field decreases from approximately 13 T at 4 K to 5.6 T at 85 K, bringing the effect within reach of a standard laboratory magnet. A model of three coupled bosonic modes shows that the magnon-phonon coupling constant, approximately 2.7 cm^−1 at low temperatures, decreases significantly with increasing temperature, following a trend similar to the temperature-induced softening of the magnon mode. This decrease in magnon-phonon coupling is discussed in terms of a possible reduction in sublattice magnetization due to thermal fluctuations.
ER  -