Crystal field excitation in the chiral helimagnet YbNi$_3$Al$_9$
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866917527241621504 |
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| author | Tsukagoshi, Mitsuru Kishida, Suguru Kurauchi, Kenshin Ito, Daichi Kubo, Koya Matsumura, Takeshi Ikeda, Yoichi Nakamura, Shota Ohara, Shigeo |
| author_facet | Tsukagoshi, Mitsuru Kishida, Suguru Kurauchi, Kenshin Ito, Daichi Kubo, Koya Matsumura, Takeshi Ikeda, Yoichi Nakamura, Shota Ohara, Shigeo |
| contents | Crystal field level scheme of a uniaxial chiral helimagnet YbNi$_3$Al$_9$, exhibiting a chiral magnetic soliton lattice state by Cu substitution for Ni, has been determined by inelastic neutron scattering. The ground and the first excited doublets are separated by 44 K and are simply expressed as $α|\pm 7/2\rangle + β|\mp 5/2\rangle$ with $α$ and $β$ nearly equal to $\pm 1/\sqrt{2}$. The easy axis of the crystal field anisotropy is the $c$ axis when the excited levels are populated at high temperatures and high magnetic fields. On the other hand, the magnetism at low temperatures and low magnetic fields, where only the ground doublet is populated, is described by an easy plane anisotropy which may be treated as an $S=1/2$ system with an anisotropic $g$-factor, $g_{xy}=3.02$ and $g_z=1.14$. An orbital dependent exchange interaction is also discussed to explain the temperature dependence of the magnetic susceptibility based on this level scheme. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_12661 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Crystal field excitation in the chiral helimagnet YbNi$_3$Al$_9$ Tsukagoshi, Mitsuru Kishida, Suguru Kurauchi, Kenshin Ito, Daichi Kubo, Koya Matsumura, Takeshi Ikeda, Yoichi Nakamura, Shota Ohara, Shigeo Strongly Correlated Electrons Crystal field level scheme of a uniaxial chiral helimagnet YbNi$_3$Al$_9$, exhibiting a chiral magnetic soliton lattice state by Cu substitution for Ni, has been determined by inelastic neutron scattering. The ground and the first excited doublets are separated by 44 K and are simply expressed as $α|\pm 7/2\rangle + β|\mp 5/2\rangle$ with $α$ and $β$ nearly equal to $\pm 1/\sqrt{2}$. The easy axis of the crystal field anisotropy is the $c$ axis when the excited levels are populated at high temperatures and high magnetic fields. On the other hand, the magnetism at low temperatures and low magnetic fields, where only the ground doublet is populated, is described by an easy plane anisotropy which may be treated as an $S=1/2$ system with an anisotropic $g$-factor, $g_{xy}=3.02$ and $g_z=1.14$. An orbital dependent exchange interaction is also discussed to explain the temperature dependence of the magnetic susceptibility based on this level scheme. |
| title | Crystal field excitation in the chiral helimagnet YbNi$_3$Al$_9$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2303.12661 |