Local probe evidence supporting altermagnetism in Co$_{1/4}$NbSe$_2$
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
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2025
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| author | Graham, J. N. Hicken, T. J. Regmi, R. B. Janoschek, M. Mazin, I. Luetkens, H. Ghimire, N. J. Guguchia, Z. |
| author_facet | Graham, J. N. Hicken, T. J. Regmi, R. B. Janoschek, M. Mazin, I. Luetkens, H. Ghimire, N. J. Guguchia, Z. |
| contents | Muon spin rotation ($μ$SR), combined with muon stopping site and local field analysis, was used to investigate the magnetic properties of cobalt intercalated 2H-NbSe$_2$ (Co$_{1/4}$NbSe$_2$). Co$_{1/4}$NbSe$_2$ is predicted to be an altermagnet, and whilst neutron diffraction has proposed its magnetic structure, microscopic details such as the magnetic volume fraction remain unclear. Therefore, a local probe investigation of its magnetism is essential. Here, we report the determination of the magnetically ordered volume fraction, ordered moment size, and magnetic structure. Our results reveal a sharp second-order transition to a full-volume-fraction, homogeneous magnetic order below $T_\mathrm{N}~=~168~$K. The moments are aligned antiparallel along the $c$-axis, consistent with neutron diffraction and altermagnetism. $μ$SR reveals that the state remains stable under a $c$-axis magnetic field up to $0.78~$T, with magnetisation measurements suggesting this robust regimes extends to at least $5$~T. Within the time resolution of $μ$SR, no precursor slow altermagnetic fluctuations were detected above $T_\mathrm{N}$, which is important for interpreting the band splitting in the paramagnetic state reported by photoemission studies. These findings support altermagnetism in Co$_{1/4}$NbSe$_2$ and motivate further experiments to explore the tunability of its magnetic and electronic structure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_09193 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Local probe evidence supporting altermagnetism in Co$_{1/4}$NbSe$_2$ Graham, J. N. Hicken, T. J. Regmi, R. B. Janoschek, M. Mazin, I. Luetkens, H. Ghimire, N. J. Guguchia, Z. Strongly Correlated Electrons Materials Science Muon spin rotation ($μ$SR), combined with muon stopping site and local field analysis, was used to investigate the magnetic properties of cobalt intercalated 2H-NbSe$_2$ (Co$_{1/4}$NbSe$_2$). Co$_{1/4}$NbSe$_2$ is predicted to be an altermagnet, and whilst neutron diffraction has proposed its magnetic structure, microscopic details such as the magnetic volume fraction remain unclear. Therefore, a local probe investigation of its magnetism is essential. Here, we report the determination of the magnetically ordered volume fraction, ordered moment size, and magnetic structure. Our results reveal a sharp second-order transition to a full-volume-fraction, homogeneous magnetic order below $T_\mathrm{N}~=~168~$K. The moments are aligned antiparallel along the $c$-axis, consistent with neutron diffraction and altermagnetism. $μ$SR reveals that the state remains stable under a $c$-axis magnetic field up to $0.78~$T, with magnetisation measurements suggesting this robust regimes extends to at least $5$~T. Within the time resolution of $μ$SR, no precursor slow altermagnetic fluctuations were detected above $T_\mathrm{N}$, which is important for interpreting the band splitting in the paramagnetic state reported by photoemission studies. These findings support altermagnetism in Co$_{1/4}$NbSe$_2$ and motivate further experiments to explore the tunability of its magnetic and electronic structure. |
| title | Local probe evidence supporting altermagnetism in Co$_{1/4}$NbSe$_2$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2503.09193 |