Magnetic structure of the topological semimetal Co3Sn2 S2
Co3Sn2S2 has recently been predicted to be a Weyl semimetal in which magnetic order is key to its behavior as a topological material. Here, we report unpolarized neutron diffraction and spherical neutron polarimetry measurements, supported by magnetization and transport data, which probe the magneti...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Physical Society
2022
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| _version_ | 1797106556076032000 |
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| author | Soh, JR Yi, C Zivkovic, I Qureshi, N Stunault, A Ouladdiaf, B Rodríguez-Velamazán, JA Shi, Y Rønnow, HM Boothroyd, AT |
| author_facet | Soh, JR Yi, C Zivkovic, I Qureshi, N Stunault, A Ouladdiaf, B Rodríguez-Velamazán, JA Shi, Y Rønnow, HM Boothroyd, AT |
| author_sort | Soh, JR |
| collection | OXFORD |
| description | Co3Sn2S2 has recently been predicted to be a Weyl semimetal in which magnetic order is key to its behavior as a topological material. Here, we report unpolarized neutron diffraction and spherical neutron polarimetry measurements, supported by magnetization and transport data, which probe the magnetic order in Co3Sn2S2 below TC=177 K. The results are fully consistent with ferromagnetic order in which the spins on the Co atoms point along the crystal c axis, although we cannot rule out some canting of the spins. We find no evidence for a type of long-ranged (k=0) in-plane 120° antiferromagnetic order which had previously been considered as a secondary phase present at temperatures between ∼90 K and TC. A discontinuous change in bulk properties and neutron polarization observed at T=125 K when samples are cooled in a field and measured on warming is found to be due to a sudden reduction in ferromagnetic domain size. Our results lend support to the theoretical predictions that Co3Sn2S2 is a magnetic Weyl semimetal. |
| first_indexed | 2024-03-07T07:04:10Z |
| format | Journal article |
| id | oxford-uuid:0be74d81-7fab-4eb6-b865-27f7f8c5838b |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:04:10Z |
| publishDate | 2022 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:0be74d81-7fab-4eb6-b865-27f7f8c5838b2022-04-25T12:09:25ZMagnetic structure of the topological semimetal Co3Sn2 S2Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:0be74d81-7fab-4eb6-b865-27f7f8c5838bEnglishSymplectic ElementsAmerican Physical Society2022Soh, JRYi, CZivkovic, IQureshi, NStunault, AOuladdiaf, BRodríguez-Velamazán, JAShi, YRønnow, HMBoothroyd, ATCo3Sn2S2 has recently been predicted to be a Weyl semimetal in which magnetic order is key to its behavior as a topological material. Here, we report unpolarized neutron diffraction and spherical neutron polarimetry measurements, supported by magnetization and transport data, which probe the magnetic order in Co3Sn2S2 below TC=177 K. The results are fully consistent with ferromagnetic order in which the spins on the Co atoms point along the crystal c axis, although we cannot rule out some canting of the spins. We find no evidence for a type of long-ranged (k=0) in-plane 120° antiferromagnetic order which had previously been considered as a secondary phase present at temperatures between ∼90 K and TC. A discontinuous change in bulk properties and neutron polarization observed at T=125 K when samples are cooled in a field and measured on warming is found to be due to a sudden reduction in ferromagnetic domain size. Our results lend support to the theoretical predictions that Co3Sn2S2 is a magnetic Weyl semimetal. |
| spellingShingle | Soh, JR Yi, C Zivkovic, I Qureshi, N Stunault, A Ouladdiaf, B Rodríguez-Velamazán, JA Shi, Y Rønnow, HM Boothroyd, AT Magnetic structure of the topological semimetal Co3Sn2 S2 |
| title | Magnetic structure of the topological semimetal Co3Sn2 S2 |
| title_full | Magnetic structure of the topological semimetal Co3Sn2 S2 |
| title_fullStr | Magnetic structure of the topological semimetal Co3Sn2 S2 |
| title_full_unstemmed | Magnetic structure of the topological semimetal Co3Sn2 S2 |
| title_short | Magnetic structure of the topological semimetal Co3Sn2 S2 |
| title_sort | magnetic structure of the topological semimetal co3sn2 s2 |
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