Brightened Optical Transition as Indicator of Multiferroicity in a Layered Antiferromagnet
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916659909885952 |
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| author | Multian, Volodymyr Wu, Fan van der Marel, Dirk Ubrig, Nicolas Teyssier, Jérémie |
| author_facet | Multian, Volodymyr Wu, Fan van der Marel, Dirk Ubrig, Nicolas Teyssier, Jérémie |
| contents | Two-dimensional van der Waals magnets show strong interconnection between their electrical, magnetic, and structural properties. Here we reveal the emergence of a luminescent transition upon crossing the Néel transition temperature of CrPS$_4$, a layered antiferromagnetic semiconductor. This luminescent transition occurs above the lowest absorption level. We attribute the optical transitions to excited states of the t$_{\rm 2g}$ orbitals of the Cr$^{3+}$ ions, which are influenced by the distortion of the octahedral crystal field. Specifically, we find at the crossing of the Néel temperature changes the distortion from an anti-polar to polar arrangement, thereby not only activating an additional luminescent pathway but also inducing a significant in-plane static dipole moment detected by a marked enhancement in the intensity of the second harmonic generation. Our findings suggest the presence of a multiferroic state in CrPS$_4$ below the Néel temperature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_17144 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Brightened Optical Transition as Indicator of Multiferroicity in a Layered Antiferromagnet Multian, Volodymyr Wu, Fan van der Marel, Dirk Ubrig, Nicolas Teyssier, Jérémie Materials Science Two-dimensional van der Waals magnets show strong interconnection between their electrical, magnetic, and structural properties. Here we reveal the emergence of a luminescent transition upon crossing the Néel transition temperature of CrPS$_4$, a layered antiferromagnetic semiconductor. This luminescent transition occurs above the lowest absorption level. We attribute the optical transitions to excited states of the t$_{\rm 2g}$ orbitals of the Cr$^{3+}$ ions, which are influenced by the distortion of the octahedral crystal field. Specifically, we find at the crossing of the Néel temperature changes the distortion from an anti-polar to polar arrangement, thereby not only activating an additional luminescent pathway but also inducing a significant in-plane static dipole moment detected by a marked enhancement in the intensity of the second harmonic generation. Our findings suggest the presence of a multiferroic state in CrPS$_4$ below the Néel temperature. |
| title | Brightened Optical Transition as Indicator of Multiferroicity in a Layered Antiferromagnet |
| topic | Materials Science |
| url | https://arxiv.org/abs/2405.17144 |