Off-Diagonal dipolar interactions in the mixed Ising--XY magnet $LiHo_{x}Er_{1-x}F_4$
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arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866909738515562496 |
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| author | Dollberg, Tomer Schechter, Moshe |
| author_facet | Dollberg, Tomer Schechter, Moshe |
| contents | We theoretically investigate the influence of off-diagonal dipolar interactions in the mixed-anisotropy magnet $LiHo_{x}Er_{1-x}F_4$. Motivated by experimental observations showing an unexpectedly rapid suppression of the ferromagnetic transition temperature $T_c$ upon substitution of Ho by Er ions, we use Monte Carlo simulations incorporating off-diagonal dipolar terms to elucidate the underlying physical mechanism. Our results reveal that, unlike in the diluted magnet $LiHo_{x}Y_{1-x}F_4$, where dilution weakens the effect of these interactions, substitution by planar Er ions amplifies it. This leads to a pronounced reduction of $T_c$, closely matching experimental data, thereby resolving discrepancies with mean-field predictions. The findings underscore the essential role of off-diagonal dipolar interactions in determining the magnetic properties of mixed-anisotropy dipolar systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_11994 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Off-Diagonal dipolar interactions in the mixed Ising--XY magnet $LiHo_{x}Er_{1-x}F_4$ Dollberg, Tomer Schechter, Moshe Strongly Correlated Electrons We theoretically investigate the influence of off-diagonal dipolar interactions in the mixed-anisotropy magnet $LiHo_{x}Er_{1-x}F_4$. Motivated by experimental observations showing an unexpectedly rapid suppression of the ferromagnetic transition temperature $T_c$ upon substitution of Ho by Er ions, we use Monte Carlo simulations incorporating off-diagonal dipolar terms to elucidate the underlying physical mechanism. Our results reveal that, unlike in the diluted magnet $LiHo_{x}Y_{1-x}F_4$, where dilution weakens the effect of these interactions, substitution by planar Er ions amplifies it. This leads to a pronounced reduction of $T_c$, closely matching experimental data, thereby resolving discrepancies with mean-field predictions. The findings underscore the essential role of off-diagonal dipolar interactions in determining the magnetic properties of mixed-anisotropy dipolar systems. |
| title | Off-Diagonal dipolar interactions in the mixed Ising--XY magnet $LiHo_{x}Er_{1-x}F_4$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2508.11994 |