Magnetic excitation spectrum and hierarchy of magnetic interactions in ErFeO3
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| Format: | Preprint |
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2026
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| _version_ | 1866909004615122944 |
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| author | Bhosale, Dnyaneshwar R. Fabrykiewicz, Piotr Adroja, Devashibhai Meven, Martin Schneidewind, Astrid Stekiel, Michal |
| author_facet | Bhosale, Dnyaneshwar R. Fabrykiewicz, Piotr Adroja, Devashibhai Meven, Martin Schneidewind, Astrid Stekiel, Michal |
| contents | We report a comprehensive investigation of the excitation spectrum of ErFeO$_3$ orthoferrite by means of time-of-flight neutron spectroscopy. The spectrum consists of two distinct components: strongly dispersive spin wave excitations of the Fe$^{3+}$ sublattice spanning $\approx$~9 - 65 meV, and crystal electric field (CEF) excitations of Er$^{3+}$ ions below 36 meV. The observed spin wave dispersions and spectral weight are well captured within linear spin wave theory, enabling extraction of the key Fe-Fe exchange parameters. Low-energy incident neutrons with their enhanced energy resolution, further revealed the dispersive character and splitting of Kramers-degenerate CEF levels. We show that the dispersion is caused by the exchange coupling between Er$^{3+}$ ions, while the degeneracy is lifted by interactions between the Er$^{3+}$ and Fe$^{3+}$ sublattices. We further explore the influence of dipolar and antisymmetric exchange interactions with the focus on the magnetic ground state of ErFeO$_3$, with particular attention to the low-temperature spin arrangement. Taken together, our results provide a detailed account of the spin dynamics in ErFeO$_3$ and reveal a hierarchy of interactions scales characteristic for orthoferrites. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_27857 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Magnetic excitation spectrum and hierarchy of magnetic interactions in ErFeO3 Bhosale, Dnyaneshwar R. Fabrykiewicz, Piotr Adroja, Devashibhai Meven, Martin Schneidewind, Astrid Stekiel, Michal Strongly Correlated Electrons Materials Science We report a comprehensive investigation of the excitation spectrum of ErFeO$_3$ orthoferrite by means of time-of-flight neutron spectroscopy. The spectrum consists of two distinct components: strongly dispersive spin wave excitations of the Fe$^{3+}$ sublattice spanning $\approx$~9 - 65 meV, and crystal electric field (CEF) excitations of Er$^{3+}$ ions below 36 meV. The observed spin wave dispersions and spectral weight are well captured within linear spin wave theory, enabling extraction of the key Fe-Fe exchange parameters. Low-energy incident neutrons with their enhanced energy resolution, further revealed the dispersive character and splitting of Kramers-degenerate CEF levels. We show that the dispersion is caused by the exchange coupling between Er$^{3+}$ ions, while the degeneracy is lifted by interactions between the Er$^{3+}$ and Fe$^{3+}$ sublattices. We further explore the influence of dipolar and antisymmetric exchange interactions with the focus on the magnetic ground state of ErFeO$_3$, with particular attention to the low-temperature spin arrangement. Taken together, our results provide a detailed account of the spin dynamics in ErFeO$_3$ and reveal a hierarchy of interactions scales characteristic for orthoferrites. |
| title | Magnetic excitation spectrum and hierarchy of magnetic interactions in ErFeO3 |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2604.27857 |