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| Autores principales: | , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2512.21876 |
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| _version_ | 1866915694680997888 |
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| author | Takahashi, Ryunosuke Seno, Hayato Takahashi, Marin Tomita, Shigetoshi Fukunaga, Reo Nakata, Suguru Nagai, Takayuki Yamagishi, Shigetada Kajita, Yoichi Kimura, Tsuyoshi Kanzaki, Masami Wadati, Hiroki |
| author_facet | Takahashi, Ryunosuke Seno, Hayato Takahashi, Marin Tomita, Shigetoshi Fukunaga, Reo Nakata, Suguru Nagai, Takayuki Yamagishi, Shigetada Kajita, Yoichi Kimura, Tsuyoshi Kanzaki, Masami Wadati, Hiroki |
| contents | Ferroaxial order is characterized by the breaking of mirror symmetry parallel to the crystallographic principal axis, which often originates from spontaneous rotational distortions of the crystal lattice. Such rotational distortions are, by symmetry, allowed to couple to specific phonon modes. However, Raman-active phonons associated with these rotational distortions have not yet been clearly identified on a symmetry-consistent basis. Here, we perform polarization-resolved Raman spectroscopy on the ferroaxial phase of Na2BaNi(PO4)2 single crystals and combine the measurements with first-principles lattice-dynamics calculations. This symmetry-guided analysis enables a comprehensive assignment of Raman-active modes in the ferroaxial phase. Several low-frequency Ag modes exhibit finite linewidth broadening, suggesting that these phonons may be weakly affected by the underlying rotational distortion. These results establish a symmetry-based spectroscopic framework for analyzing phonons associated with rotational distortions in ferroaxial materials and provide a basis for future studies of ferroaxial order in complex oxides. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_21876 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Raman Spectroscopic Investigation of Ferroaxial Order in Na2BaNi(PO4)2 Single Crystals Takahashi, Ryunosuke Seno, Hayato Takahashi, Marin Tomita, Shigetoshi Fukunaga, Reo Nakata, Suguru Nagai, Takayuki Yamagishi, Shigetada Kajita, Yoichi Kimura, Tsuyoshi Kanzaki, Masami Wadati, Hiroki Materials Science J.2 Ferroaxial order is characterized by the breaking of mirror symmetry parallel to the crystallographic principal axis, which often originates from spontaneous rotational distortions of the crystal lattice. Such rotational distortions are, by symmetry, allowed to couple to specific phonon modes. However, Raman-active phonons associated with these rotational distortions have not yet been clearly identified on a symmetry-consistent basis. Here, we perform polarization-resolved Raman spectroscopy on the ferroaxial phase of Na2BaNi(PO4)2 single crystals and combine the measurements with first-principles lattice-dynamics calculations. This symmetry-guided analysis enables a comprehensive assignment of Raman-active modes in the ferroaxial phase. Several low-frequency Ag modes exhibit finite linewidth broadening, suggesting that these phonons may be weakly affected by the underlying rotational distortion. These results establish a symmetry-based spectroscopic framework for analyzing phonons associated with rotational distortions in ferroaxial materials and provide a basis for future studies of ferroaxial order in complex oxides. |
| title | Raman Spectroscopic Investigation of Ferroaxial Order in Na2BaNi(PO4)2 Single Crystals |
| topic | Materials Science J.2 |
| url | https://arxiv.org/abs/2512.21876 |