Interplay between magnetic and lattice excitations and emergent multiple phase transitions in MnPSe3-xSx
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916210180882432 |
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| author | Kumar, Deepu Hoang, Nguyen The Sim, Yumin Choi, Youngsu Raju, Kalaivanan Ulaganathan, Rajesh Kumar Sankar, Raman Seong, Maeng-Je Choi, Kwang-Yong |
| author_facet | Kumar, Deepu Hoang, Nguyen The Sim, Yumin Choi, Youngsu Raju, Kalaivanan Ulaganathan, Rajesh Kumar Sankar, Raman Seong, Maeng-Je Choi, Kwang-Yong |
| contents | The intricate interplay between spin and lattice degrees of freedom in two-dimensional magnetic materials plays a pivotal role in modifying their magnetic characteristics, engendering hybrid quasiparticles, and implementing functional devices. Herein, we present our comprehensive and in-depth investigations on magnetic and lattice excitations of MnPSe3-xSx (x = 0, 0.5, and 1.5) alloys, utilizing temperature- and polarization-dependent Raman scattering. Our experimental results reveal the occurrence of multiple phase transitions, evidenced by notable changes in phonon self-energy and the appearance or splitting of phonon modes. These emergent phases are tied to the development of long and short-range spin-spin correlations, as well as to spin reorientations or magnetic instabilities. Our analysis of two-magnon excitations as a function of temperature and composition showcases their hybridization with phonons whose degree weakens with increasing x. Moreover, the suppression of spin-dependent phonon intensity in chemically most-disordered MnPSe3-xSx (x = 1.5) suggests that chalcogen substitution offers a control knob of tuning spin and phonon dynamics by modulating concurrently superexchange pathways and a degree of trigonal distortions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_11099 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Interplay between magnetic and lattice excitations and emergent multiple phase transitions in MnPSe3-xSx Kumar, Deepu Hoang, Nguyen The Sim, Yumin Choi, Youngsu Raju, Kalaivanan Ulaganathan, Rajesh Kumar Sankar, Raman Seong, Maeng-Je Choi, Kwang-Yong Materials Science The intricate interplay between spin and lattice degrees of freedom in two-dimensional magnetic materials plays a pivotal role in modifying their magnetic characteristics, engendering hybrid quasiparticles, and implementing functional devices. Herein, we present our comprehensive and in-depth investigations on magnetic and lattice excitations of MnPSe3-xSx (x = 0, 0.5, and 1.5) alloys, utilizing temperature- and polarization-dependent Raman scattering. Our experimental results reveal the occurrence of multiple phase transitions, evidenced by notable changes in phonon self-energy and the appearance or splitting of phonon modes. These emergent phases are tied to the development of long and short-range spin-spin correlations, as well as to spin reorientations or magnetic instabilities. Our analysis of two-magnon excitations as a function of temperature and composition showcases their hybridization with phonons whose degree weakens with increasing x. Moreover, the suppression of spin-dependent phonon intensity in chemically most-disordered MnPSe3-xSx (x = 1.5) suggests that chalcogen substitution offers a control knob of tuning spin and phonon dynamics by modulating concurrently superexchange pathways and a degree of trigonal distortions. |
| title | Interplay between magnetic and lattice excitations and emergent multiple phase transitions in MnPSe3-xSx |
| topic | Materials Science |
| url | https://arxiv.org/abs/2404.11099 |