Evidence of spin-phonon-charge coupling in quasi-one-dimensional Ising spin chain system $α$-CoV$_2$O$_6$
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866913757217685504 |
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| author | Naik, Debismita Chakraborty, Souvick Singh, Akriti Mondal, Ayan Saha, Surajit Mahalingam, Venkataramanan Raj, Satyabrata Khatua, Pradip |
| author_facet | Naik, Debismita Chakraborty, Souvick Singh, Akriti Mondal, Ayan Saha, Surajit Mahalingam, Venkataramanan Raj, Satyabrata Khatua, Pradip |
| contents | The quasi-one-dimensional Ising spin chain system $α$-CoV$_2$O$_6$ is considered to exhibit fascinating magnetic properties at lower temperatures. We comprehensively study magnetic properties and lattice dynamics using a combination of x-ray diffraction (XRD), DC magnetization, specific heat, temperature-dependent XRD and Raman scattering measurements, along with the theoretical charge density map calculations. The DC magnetization and specific heat confirm the antiferromagnetic (AFM) long-range order (LRO) at Neel temperature T$_N$ = 15 K as well as the short-range ordering (SRO) below 100 K. Temperature-dependent Raman measurement has been performed in the temperature range of 5 K to 180 K, revealing spin-phonon coupling (SPC) below 100 K, which is well above the T$_N$ and is attributed to SRO. The SPC is calculated for different vibrational modes. The temperature-dependent XRD supports the key finding of magnetoelastic coupling at T$_N$, which is strongly correlated to the magnetoelectric phenomena. The renormalization of Raman modes and lattice anomalies near T$_N$ illustrate spin-lattice coupling via magnetoelastic and spin-phonon interactions leading to the interplay between spin, charge, and phonon degrees of freedom in $α$-CoV$_2$O$_6$. The presence of spin-charge coupling is confirmed by the theoretical charge density maps, which show that the formation of electric dipoles between the Co and O atoms in the AFM state results from the p-d hybridization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_19477 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evidence of spin-phonon-charge coupling in quasi-one-dimensional Ising spin chain system $α$-CoV$_2$O$_6$ Naik, Debismita Chakraborty, Souvick Singh, Akriti Mondal, Ayan Saha, Surajit Mahalingam, Venkataramanan Raj, Satyabrata Khatua, Pradip Materials Science The quasi-one-dimensional Ising spin chain system $α$-CoV$_2$O$_6$ is considered to exhibit fascinating magnetic properties at lower temperatures. We comprehensively study magnetic properties and lattice dynamics using a combination of x-ray diffraction (XRD), DC magnetization, specific heat, temperature-dependent XRD and Raman scattering measurements, along with the theoretical charge density map calculations. The DC magnetization and specific heat confirm the antiferromagnetic (AFM) long-range order (LRO) at Neel temperature T$_N$ = 15 K as well as the short-range ordering (SRO) below 100 K. Temperature-dependent Raman measurement has been performed in the temperature range of 5 K to 180 K, revealing spin-phonon coupling (SPC) below 100 K, which is well above the T$_N$ and is attributed to SRO. The SPC is calculated for different vibrational modes. The temperature-dependent XRD supports the key finding of magnetoelastic coupling at T$_N$, which is strongly correlated to the magnetoelectric phenomena. The renormalization of Raman modes and lattice anomalies near T$_N$ illustrate spin-lattice coupling via magnetoelastic and spin-phonon interactions leading to the interplay between spin, charge, and phonon degrees of freedom in $α$-CoV$_2$O$_6$. The presence of spin-charge coupling is confirmed by the theoretical charge density maps, which show that the formation of electric dipoles between the Co and O atoms in the AFM state results from the p-d hybridization. |
| title | Evidence of spin-phonon-charge coupling in quasi-one-dimensional Ising spin chain system $α$-CoV$_2$O$_6$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2503.19477 |