Magnetostriction-Driven Muon Localization in an Antiferromagnetic Oxide
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arXiv
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| Format: | Preprint |
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2023
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| author | Bonfà, Pietro Onuorah, Ifeanyi John Lang, Franz Timrov, Iurii Monacelli, Lorenzo Wang, Chennan Sun, Xiao Petracic, Oleg Pizzi, Giovanni Marzari, Nicola Blundell, Stephen J. De Renzi, Roberto |
| author_facet | Bonfà, Pietro Onuorah, Ifeanyi John Lang, Franz Timrov, Iurii Monacelli, Lorenzo Wang, Chennan Sun, Xiao Petracic, Oleg Pizzi, Giovanni Marzari, Nicola Blundell, Stephen J. De Renzi, Roberto |
| contents | Magnetostriction drives a rhombohedral distortion in the cubic rock salt antiferromagnet MnO at the Néel temperature $T_{N}=118$ K. As an unexpected consequence we show that this distortion acts to localize the site of an implanted muon due to the accompanying redistribution of electron density. This lifts the degeneracy between equivalent sites, resulting in a single observed muon precession frequency. Above $T_{N}$, the muon instead becomes delocalized around a network of equivalent sites. Our first-principles simulations based on Hubbard-corrected density-functional theory and molecular dynamics are consistent with our experimental data and help to resolve a long-standing puzzle regarding muon data on MnO, as well as having wider applicability to other magnetic oxides. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2305_12237 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Magnetostriction-Driven Muon Localization in an Antiferromagnetic Oxide Bonfà, Pietro Onuorah, Ifeanyi John Lang, Franz Timrov, Iurii Monacelli, Lorenzo Wang, Chennan Sun, Xiao Petracic, Oleg Pizzi, Giovanni Marzari, Nicola Blundell, Stephen J. De Renzi, Roberto Strongly Correlated Electrons Materials Science Magnetostriction drives a rhombohedral distortion in the cubic rock salt antiferromagnet MnO at the Néel temperature $T_{N}=118$ K. As an unexpected consequence we show that this distortion acts to localize the site of an implanted muon due to the accompanying redistribution of electron density. This lifts the degeneracy between equivalent sites, resulting in a single observed muon precession frequency. Above $T_{N}$, the muon instead becomes delocalized around a network of equivalent sites. Our first-principles simulations based on Hubbard-corrected density-functional theory and molecular dynamics are consistent with our experimental data and help to resolve a long-standing puzzle regarding muon data on MnO, as well as having wider applicability to other magnetic oxides. |
| title | Magnetostriction-Driven Muon Localization in an Antiferromagnetic Oxide |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2305.12237 |