Non-collinear ferromagnetism in the Kondo lattice Ce$_5$CoGe$_2$
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910151946010624 |
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| author | Wu, Jinyu Zhang, Jiawen Shiroka, Toni Islam, Shams Sohel Wang, Mingyi Zhang, Yongjun Adroja, Devashibhai T. Liu, Yu Yuan, Huiqiu Smidman, Michael |
| author_facet | Wu, Jinyu Zhang, Jiawen Shiroka, Toni Islam, Shams Sohel Wang, Mingyi Zhang, Yongjun Adroja, Devashibhai T. Liu, Yu Yuan, Huiqiu Smidman, Michael |
| contents | The dense Kondo lattice Ce$_5$CoGe$_2$ exhibits superconductivity once the magnetic ordering is suppressed by pressure. Here the ambient pressure magnetic state is investigated via magnetization, heat capacity, powder neutron diffraction, and muon spin relaxation ($μ$SR) measurements. Neutron diffraction results reveal a noncollinear ferromagnetic structure, where the four inequivalent Ce sites exhibit different magnetic moments. Point-charge model calculations of the crystalline-electric field (CEF) ground states corroborate different moments between the sites, and suggest sizeable components of the moments along different directions, consistent with the non-collinear structure. Analysis of the Dzyaloshinskii-Moriya (DM) interaction for the bonds connecting Ce atoms demonstrates that most of these bonds exhibit a nonzero DM vector, suggesting that competition between intersite magnetic exchange interactions, CEF driven single-ion anisotropy, the Kondo effect and the DM interaction may drive the non-collinear ferromagnetism. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_19592 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Non-collinear ferromagnetism in the Kondo lattice Ce$_5$CoGe$_2$ Wu, Jinyu Zhang, Jiawen Shiroka, Toni Islam, Shams Sohel Wang, Mingyi Zhang, Yongjun Adroja, Devashibhai T. Liu, Yu Yuan, Huiqiu Smidman, Michael Strongly Correlated Electrons The dense Kondo lattice Ce$_5$CoGe$_2$ exhibits superconductivity once the magnetic ordering is suppressed by pressure. Here the ambient pressure magnetic state is investigated via magnetization, heat capacity, powder neutron diffraction, and muon spin relaxation ($μ$SR) measurements. Neutron diffraction results reveal a noncollinear ferromagnetic structure, where the four inequivalent Ce sites exhibit different magnetic moments. Point-charge model calculations of the crystalline-electric field (CEF) ground states corroborate different moments between the sites, and suggest sizeable components of the moments along different directions, consistent with the non-collinear structure. Analysis of the Dzyaloshinskii-Moriya (DM) interaction for the bonds connecting Ce atoms demonstrates that most of these bonds exhibit a nonzero DM vector, suggesting that competition between intersite magnetic exchange interactions, CEF driven single-ion anisotropy, the Kondo effect and the DM interaction may drive the non-collinear ferromagnetism. |
| title | Non-collinear ferromagnetism in the Kondo lattice Ce$_5$CoGe$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2603.19592 |