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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2601.22078 |
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| _version_ | 1866910005011152896 |
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| author | Wójcik, Krzysztof P. Kwasigroch, Michał P. |
| author_facet | Wójcik, Krzysztof P. Kwasigroch, Michał P. |
| contents | We investigate a single magnetic impurity in the presence of strong spin-orbit coupling and single-ion anisotropy. We show that at sufficiently strong coupling there exists a finite temperature window, before the moment is completely screened, where the magnetic anisotropy of the system flips: the hard-axis becomes the easy-axis or vice versa. We derive this rigorously for a single impurity using numerical renormalization group calculations as well as Nozieres' strong-coupling limit and discuss its relevance to heavy-fermion compounds which order magnetically along the hard-direction. We show that the coexistence of Curie-like response and Kondo fluctuations is stabilized along the initially hard direction leading to the anisotropy switch. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_22078 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Inverted anisotropy of the partially screened magnetic impurity Wójcik, Krzysztof P. Kwasigroch, Michał P. Strongly Correlated Electrons We investigate a single magnetic impurity in the presence of strong spin-orbit coupling and single-ion anisotropy. We show that at sufficiently strong coupling there exists a finite temperature window, before the moment is completely screened, where the magnetic anisotropy of the system flips: the hard-axis becomes the easy-axis or vice versa. We derive this rigorously for a single impurity using numerical renormalization group calculations as well as Nozieres' strong-coupling limit and discuss its relevance to heavy-fermion compounds which order magnetically along the hard-direction. We show that the coexistence of Curie-like response and Kondo fluctuations is stabilized along the initially hard direction leading to the anisotropy switch. |
| title | Inverted anisotropy of the partially screened magnetic impurity |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2601.22078 |