Signatures of novel magnon-phonon coupling in frustrated double perovskite square lattices
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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_ | 1866910291974946816 |
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| author | Badola, Shalini Joshi, Aprajita Singh, Akriti Saha, Surajit |
| author_facet | Badola, Shalini Joshi, Aprajita Singh, Akriti Saha, Surajit |
| contents | Low-dimensional frustrated magnetic square networks feature a variety of unconventional phases with novel emergent excitations. Often these excitations are intertwined and manifest into intriguing phenomena, an area that has remained largely unexplored in square-lattice systems, especially, double perovskites (A2BB'O6). In this study, we explore these interactions between the fundamental excitations such as phonons and magnons in square-lattice Sr2CuTeO6, Sr2CuWO6, and Ba2CuWO6 isostructural double perovskites that exhibit both short-ranged (TS) as well as long-ranged Neel antiferromagnetic (TN) transitions. Our Raman measurements at variable temperatures reveal an intriguing broad peak (identified as 2-magnon (2M)) surviving beyond TS for W-based compositions contrary to the Te-based system, suggesting a key role of diamagnetic B'-site cation on their magnetism. The thermal response of 2M intriguingly shows signatures of correlation with phonons and control over their anharmonicity, depicting magnon-phonon interaction. Further, a few phonons exhibit anomalies across the magnetic transitions implying the presence of spin-phonon coupling. In particular, the phonon modes at ~ 194 cm-1 of Sr2CuTeO6 and ~ 168 cm-1 of Sr2CuWO6, that show a strong correlation with the 2M, exhibit the strongest spin-phonon coupling suggesting their roles in mediating magnon-phonon interactions in these systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_04624 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Signatures of novel magnon-phonon coupling in frustrated double perovskite square lattices Badola, Shalini Joshi, Aprajita Singh, Akriti Saha, Surajit Materials Science Low-dimensional frustrated magnetic square networks feature a variety of unconventional phases with novel emergent excitations. Often these excitations are intertwined and manifest into intriguing phenomena, an area that has remained largely unexplored in square-lattice systems, especially, double perovskites (A2BB'O6). In this study, we explore these interactions between the fundamental excitations such as phonons and magnons in square-lattice Sr2CuTeO6, Sr2CuWO6, and Ba2CuWO6 isostructural double perovskites that exhibit both short-ranged (TS) as well as long-ranged Neel antiferromagnetic (TN) transitions. Our Raman measurements at variable temperatures reveal an intriguing broad peak (identified as 2-magnon (2M)) surviving beyond TS for W-based compositions contrary to the Te-based system, suggesting a key role of diamagnetic B'-site cation on their magnetism. The thermal response of 2M intriguingly shows signatures of correlation with phonons and control over their anharmonicity, depicting magnon-phonon interaction. Further, a few phonons exhibit anomalies across the magnetic transitions implying the presence of spin-phonon coupling. In particular, the phonon modes at ~ 194 cm-1 of Sr2CuTeO6 and ~ 168 cm-1 of Sr2CuWO6, that show a strong correlation with the 2M, exhibit the strongest spin-phonon coupling suggesting their roles in mediating magnon-phonon interactions in these systems. |
| title | Signatures of novel magnon-phonon coupling in frustrated double perovskite square lattices |
| topic | Materials Science |
| url | https://arxiv.org/abs/2401.04624 |