NMR study of the local magnetic order in the kagome Weyl semimetal Co$_3$Sn$_2$S$_2$
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912181277163520 |
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| author | Mukhamedshin, Irek Wzietek, Pawel Bert, Fabrice Mendels, Philippe Forget, Anne Colson, Dorothée Brouet, Véronique |
| author_facet | Mukhamedshin, Irek Wzietek, Pawel Bert, Fabrice Mendels, Philippe Forget, Anne Colson, Dorothée Brouet, Véronique |
| contents | A magnetic Weyl semimetal presents the intriguing possibility of controlling topological properties through magnetic order. The kagome compound \CoSnS~has emerged as one of the most thoroughly characterized magnetic Weyl semimetals, yet the potential coexistence of a ferromagnetic state below $T_c$ = 172~K with a non-collinear antiferromagnetic phase or a glassy state remains unresolved. We employ $^{59}$Co NMR to gain a local perspective on the magnetic order. The magnetic and electric field gradient tensors at room temperature are determined by fitting the NMR spectra using evolutionary algorithms. Zero-field NMR measurements reveal that all Co sites are equivalent in the magnetic phase at low temperatures and up to 90~K. The local magnetic field follows in intensity the macroscopic magnetization as a function of temperature and is tilted from the c-axis by a few degrees toward the nearest triangle center. Above 90~K, a shoulder appears on the low-field side, which we attribute to a preferential tilting of the local field in one direction, breaking the equivalence between the three Co sites of the kagome structure. We rule out any coexistence with an in-plane antiferromagnetic phase and suggest instead that in-plane ferromagnetic-like moments appear above 90~K and play an increasing role in the magnetic order up to the magnetic transition. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_11624 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | NMR study of the local magnetic order in the kagome Weyl semimetal Co$_3$Sn$_2$S$_2$ Mukhamedshin, Irek Wzietek, Pawel Bert, Fabrice Mendels, Philippe Forget, Anne Colson, Dorothée Brouet, Véronique Strongly Correlated Electrons A magnetic Weyl semimetal presents the intriguing possibility of controlling topological properties through magnetic order. The kagome compound \CoSnS~has emerged as one of the most thoroughly characterized magnetic Weyl semimetals, yet the potential coexistence of a ferromagnetic state below $T_c$ = 172~K with a non-collinear antiferromagnetic phase or a glassy state remains unresolved. We employ $^{59}$Co NMR to gain a local perspective on the magnetic order. The magnetic and electric field gradient tensors at room temperature are determined by fitting the NMR spectra using evolutionary algorithms. Zero-field NMR measurements reveal that all Co sites are equivalent in the magnetic phase at low temperatures and up to 90~K. The local magnetic field follows in intensity the macroscopic magnetization as a function of temperature and is tilted from the c-axis by a few degrees toward the nearest triangle center. Above 90~K, a shoulder appears on the low-field side, which we attribute to a preferential tilting of the local field in one direction, breaking the equivalence between the three Co sites of the kagome structure. We rule out any coexistence with an in-plane antiferromagnetic phase and suggest instead that in-plane ferromagnetic-like moments appear above 90~K and play an increasing role in the magnetic order up to the magnetic transition. |
| title | NMR study of the local magnetic order in the kagome Weyl semimetal Co$_3$Sn$_2$S$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2412.11624 |