Coexistence of Ferromagnetism and Antiferromagnetic Dimers in Topological Insulators
Fuente:
arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
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| _version_ | 1866917581259014144 |
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| author | Islam, Farhan Schlagel, Deborah Lee, Yongbin Pakhira, Santanu Pajerowski, Daniel M. Johnston, David C. Ke, Liqin Vaknin, David McQueeney, Robert J. |
| author_facet | Islam, Farhan Schlagel, Deborah Lee, Yongbin Pakhira, Santanu Pajerowski, Daniel M. Johnston, David C. Ke, Liqin Vaknin, David McQueeney, Robert J. |
| contents | The addition of magnetic impurities in topological insulators can drive ferromagnetic order that leads to novel quantum anomalous Hall transport well below the Curie temperature. The fragility of the quantized regime has been ascribed to the random nature of the magnetic moment distribution. Here, we refine this hypothesis by using inelastic neutron scattering and density-functional theory calculations to show that two antagonistic components define the magnetism in Mn-substituted SnTe, thereby limiting the effectiveness of dilute magnetic TIs. One component is strongly bound antiferromagnetic dimers that compete with ferromagnetic order. The other component consists of undimerized moments where ferromagnetic order develops via long-range interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_01531 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Coexistence of Ferromagnetism and Antiferromagnetic Dimers in Topological Insulators Islam, Farhan Schlagel, Deborah Lee, Yongbin Pakhira, Santanu Pajerowski, Daniel M. Johnston, David C. Ke, Liqin Vaknin, David McQueeney, Robert J. Strongly Correlated Electrons The addition of magnetic impurities in topological insulators can drive ferromagnetic order that leads to novel quantum anomalous Hall transport well below the Curie temperature. The fragility of the quantized regime has been ascribed to the random nature of the magnetic moment distribution. Here, we refine this hypothesis by using inelastic neutron scattering and density-functional theory calculations to show that two antagonistic components define the magnetism in Mn-substituted SnTe, thereby limiting the effectiveness of dilute magnetic TIs. One component is strongly bound antiferromagnetic dimers that compete with ferromagnetic order. The other component consists of undimerized moments where ferromagnetic order develops via long-range interactions. |
| title | Coexistence of Ferromagnetism and Antiferromagnetic Dimers in Topological Insulators |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2402.01531 |