Why Fe$_3$GaTe$_2$ has higher Curie temperature than Fe$_3$GeTe$_2$?
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915258223820800 |
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| author | Kim, Bomin Ochirkhuyag, Tumentsereg Odkhuu, Dorj Rhim, S. H. |
| author_facet | Kim, Bomin Ochirkhuyag, Tumentsereg Odkhuu, Dorj Rhim, S. H. |
| contents | Physics of Fe$_3$GaTe$_2$ having higher Curie temperature ($T_C$) than Fe$_3$GeTe$_2$ is explored theoretically in the framework of magnetic exchange interactions. Fe$_3$GaTe$_2$ and Fe$_3$GeTe$_2$ are isostructural, with Fe$_3$GaTe$_2$ having one less valence electron and smaller nearest-neighbor exchange coefficients ($J_1$ and $J_2$), challenging the conventional notion that larger $J_1$ or $J_2$ leads to a higher $T_C$. We show that higher order exchange coefficients, $J_3$ or higher, of Fe$_3$GaTe$_2$ are positive whereas those of Fe$_3$GeTe$_2$ are negative. As a consequence, total sum of all possible exchange coefficients in Fe$_3$GaTe$_2$ are larger than Fe$_3$GeTe$_2$, which accounts for higher $T_C$. To validate these findings, $T_C$ are computed using both mean-field theory and Monte Carlo simulation. Indeed, higher-order exchange interactions, when properly accounting for the number of neighbors, confirm the higher $T_C$ of Fe$_3$GaTe$_2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_17998 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Why Fe$_3$GaTe$_2$ has higher Curie temperature than Fe$_3$GeTe$_2$? Kim, Bomin Ochirkhuyag, Tumentsereg Odkhuu, Dorj Rhim, S. H. Materials Science Physics of Fe$_3$GaTe$_2$ having higher Curie temperature ($T_C$) than Fe$_3$GeTe$_2$ is explored theoretically in the framework of magnetic exchange interactions. Fe$_3$GaTe$_2$ and Fe$_3$GeTe$_2$ are isostructural, with Fe$_3$GaTe$_2$ having one less valence electron and smaller nearest-neighbor exchange coefficients ($J_1$ and $J_2$), challenging the conventional notion that larger $J_1$ or $J_2$ leads to a higher $T_C$. We show that higher order exchange coefficients, $J_3$ or higher, of Fe$_3$GaTe$_2$ are positive whereas those of Fe$_3$GeTe$_2$ are negative. As a consequence, total sum of all possible exchange coefficients in Fe$_3$GaTe$_2$ are larger than Fe$_3$GeTe$_2$, which accounts for higher $T_C$. To validate these findings, $T_C$ are computed using both mean-field theory and Monte Carlo simulation. Indeed, higher-order exchange interactions, when properly accounting for the number of neighbors, confirm the higher $T_C$ of Fe$_3$GaTe$_2$. |
| title | Why Fe$_3$GaTe$_2$ has higher Curie temperature than Fe$_3$GeTe$_2$? |
| topic | Materials Science |
| url | https://arxiv.org/abs/2504.17998 |