Signatures of three-state Potts nematicity in spin excitations of the van der Waals antiferromagnet FePSe$_3$
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866909027475128320 |
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| author | Yao, Weiliang Antonio, Viviane Peçanha Adroja, Devashibhai Alvarado, S. J. Gomez Gao, Bin Xu, Sijie Liu, Ruixian Lu, Xingye Dai, Pengcheng |
| author_facet | Yao, Weiliang Antonio, Viviane Peçanha Adroja, Devashibhai Alvarado, S. J. Gomez Gao, Bin Xu, Sijie Liu, Ruixian Lu, Xingye Dai, Pengcheng |
| contents | In two-dimensional (2D) nearly square-lattice quantum materials, electron correlations can induce an electronic nematic phase with twofold rotational ($C_2$) symmetry that profoundly impacts their properties. For 2D materials with threefold rotational ($C_3$) symmetry, such as the honeycomb lattice, a vestigial three-state Potts nematic order has been observed in the van der Waals antiferromagnet (AFM) FePSe$_3$ via optical and thermodynamic methods under uniaxial strain. Here, we use neutron scattering to study the magnetic order and spin excitations of FePSe$_3$ under uniaxial strain. In the AFM ordered state, we find that $\sim$0.6% tensile strain significantly suppresses one zigzag domain and promotes the other two, lowering the AFM order and spin waves to $C_2$ symmetry. The broken $C_3$ symmetry in spin excitations persists slightly above $T_{\rm{N}}\approx 108.6$ K, where the zigzag AFM order is absent. Our results thus provide direct evidence of magnetoelastic coupling and suggest that the three-state Potts nematicity in paramagnetic spin excitations arises from the vestigial order associated with the low-temperature zigzag AFM order. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_02475 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Signatures of three-state Potts nematicity in spin excitations of the van der Waals antiferromagnet FePSe$_3$ Yao, Weiliang Antonio, Viviane Peçanha Adroja, Devashibhai Alvarado, S. J. Gomez Gao, Bin Xu, Sijie Liu, Ruixian Lu, Xingye Dai, Pengcheng Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science In two-dimensional (2D) nearly square-lattice quantum materials, electron correlations can induce an electronic nematic phase with twofold rotational ($C_2$) symmetry that profoundly impacts their properties. For 2D materials with threefold rotational ($C_3$) symmetry, such as the honeycomb lattice, a vestigial three-state Potts nematic order has been observed in the van der Waals antiferromagnet (AFM) FePSe$_3$ via optical and thermodynamic methods under uniaxial strain. Here, we use neutron scattering to study the magnetic order and spin excitations of FePSe$_3$ under uniaxial strain. In the AFM ordered state, we find that $\sim$0.6% tensile strain significantly suppresses one zigzag domain and promotes the other two, lowering the AFM order and spin waves to $C_2$ symmetry. The broken $C_3$ symmetry in spin excitations persists slightly above $T_{\rm{N}}\approx 108.6$ K, where the zigzag AFM order is absent. Our results thus provide direct evidence of magnetoelastic coupling and suggest that the three-state Potts nematicity in paramagnetic spin excitations arises from the vestigial order associated with the low-temperature zigzag AFM order. |
| title | Signatures of three-state Potts nematicity in spin excitations of the van der Waals antiferromagnet FePSe$_3$ |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2509.02475 |