Coupling of magnetic and lattice collective excitations in the 2D van der Waals antiferromagnet FePS$_{3}$
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866912545432928256 |
|---|---|
| author | Panda, Kartik Kapon, Itzik Dumcenco, Dumitru van der Marel, Dirk Kuzmenko, Alexey Bachar, Nimrod |
| author_facet | Panda, Kartik Kapon, Itzik Dumcenco, Dumitru van der Marel, Dirk Kuzmenko, Alexey Bachar, Nimrod |
| contents | We combine polarized infrared magneto-transmission and Faraday angle rotation measurements to map the collective excitations of the van der Waals antiferromagnet FePS$_3$. Below the Néel temperature ($T_\mathrm{N} \approx 118$ K), the phonon spectrum becomes strongly anisotropic, while a prominent excitation at 122 cm$^{-1}$ (15 meV) hardens on cooling and splits linearly with magnetic field,identifying its magnetic origin. From absolute transmission and Faraday angle measurements, we reconstruct the circular optical conductivities, revealing a pronounced dichroism of the field-split excitations. The upper branch near 129 cm$^{-1}$ shows an anomalously reduced dichroism, consistent with spin-phonon hybridization with a nearby infrared phonon. Several phonons exhibit sizable Faraday rotation, and Raman-active modes appear in the infrared spectra. Together with a broad mid-infrared band near 900 cm$^{-1}$ emerging only below $T_\mathrm{N}$, these observations point to inversion-symmetry breaking in the magnetic state. A weak Faraday feature near 320 cm$^{-1}$ ($\sim 40$ meV) further supports the presence of a higher-energy magnetic excitation. These findings underscore the intricate interplay between magnetic and lattice degrees of freedom in FePS$_3$ and establish its relevance for exploring spin-lattice interactions in two-dimensional antiferromagnetic materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_17238 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Coupling of magnetic and lattice collective excitations in the 2D van der Waals antiferromagnet FePS$_{3}$ Panda, Kartik Kapon, Itzik Dumcenco, Dumitru van der Marel, Dirk Kuzmenko, Alexey Bachar, Nimrod Strongly Correlated Electrons We combine polarized infrared magneto-transmission and Faraday angle rotation measurements to map the collective excitations of the van der Waals antiferromagnet FePS$_3$. Below the Néel temperature ($T_\mathrm{N} \approx 118$ K), the phonon spectrum becomes strongly anisotropic, while a prominent excitation at 122 cm$^{-1}$ (15 meV) hardens on cooling and splits linearly with magnetic field,identifying its magnetic origin. From absolute transmission and Faraday angle measurements, we reconstruct the circular optical conductivities, revealing a pronounced dichroism of the field-split excitations. The upper branch near 129 cm$^{-1}$ shows an anomalously reduced dichroism, consistent with spin-phonon hybridization with a nearby infrared phonon. Several phonons exhibit sizable Faraday rotation, and Raman-active modes appear in the infrared spectra. Together with a broad mid-infrared band near 900 cm$^{-1}$ emerging only below $T_\mathrm{N}$, these observations point to inversion-symmetry breaking in the magnetic state. A weak Faraday feature near 320 cm$^{-1}$ ($\sim 40$ meV) further supports the presence of a higher-energy magnetic excitation. These findings underscore the intricate interplay between magnetic and lattice degrees of freedom in FePS$_3$ and establish its relevance for exploring spin-lattice interactions in two-dimensional antiferromagnetic materials. |
| title | Coupling of magnetic and lattice collective excitations in the 2D van der Waals antiferromagnet FePS$_{3}$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.17238 |