Phonon-induced renormalization of exchange interactions in metallic two-dimensional magnets
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866914916273750016 |
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| author | Badrtdinov, Danis I. Katsnelson, Mikhail I. Rudenko, Alexander N. |
| author_facet | Badrtdinov, Danis I. Katsnelson, Mikhail I. Rudenko, Alexander N. |
| contents | The presence of spin-polarized charge carriers in metallic magnets provides a mechanism for spin-lattice interactions mediated by electron-phonon coupling. Here, we present a theory of this mechanism used to estimate its effect on the exchange interactions in 2D magnets. Starting from a square lattice model at half filling, we show that the presence of electron-phonon coupling with equilibrium phonon distribution leads to a notable suppression of exchange interactions with temperature. We then apply our approach to the prototypical 2D metallic ferromagnet, Fe$_3$GeTe$_2$, with moderate electron-phonon coupling. We find that the exchange interactions undergo a renormalization, leading to a softening of the magnon modes, and suppression of the Curie temperature by $\sim$10\%. We expect that this effect can be further enhanced in systems with strong electron-phonon coupling, as well as for non-equilibrium distribution of phonons induced by strong laser fields or charge currents. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_05229 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Phonon-induced renormalization of exchange interactions in metallic two-dimensional magnets Badrtdinov, Danis I. Katsnelson, Mikhail I. Rudenko, Alexander N. Materials Science Strongly Correlated Electrons The presence of spin-polarized charge carriers in metallic magnets provides a mechanism for spin-lattice interactions mediated by electron-phonon coupling. Here, we present a theory of this mechanism used to estimate its effect on the exchange interactions in 2D magnets. Starting from a square lattice model at half filling, we show that the presence of electron-phonon coupling with equilibrium phonon distribution leads to a notable suppression of exchange interactions with temperature. We then apply our approach to the prototypical 2D metallic ferromagnet, Fe$_3$GeTe$_2$, with moderate electron-phonon coupling. We find that the exchange interactions undergo a renormalization, leading to a softening of the magnon modes, and suppression of the Curie temperature by $\sim$10\%. We expect that this effect can be further enhanced in systems with strong electron-phonon coupling, as well as for non-equilibrium distribution of phonons induced by strong laser fields or charge currents. |
| title | Phonon-induced renormalization of exchange interactions in metallic two-dimensional magnets |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2406.05229 |