Paramagnetic electron-nuclear spin entanglement in HoCo2Zn20
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2025
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866914508577964032 |
|---|---|
| author | Kitazawa, Takafumi Shimura, Yasuyuki Onimaru, Takahiro Tsuchida, Shun Kubo, Katsunori Haga, Yoshinori Sakai, Hironori Tokiwa, Yoshifumi Kambe, Shinsaku Tokunaga, Yo |
| author_facet | Kitazawa, Takafumi Shimura, Yasuyuki Onimaru, Takahiro Tsuchida, Shun Kubo, Katsunori Haga, Yoshinori Sakai, Hironori Tokiwa, Yoshifumi Kambe, Shinsaku Tokunaga, Yo |
| contents | We investigated electron-nuclear spin entanglement in the paramagnetic ground state of the Ho-based cubic compound HoCo2Zn20. From analyses of magnetization and specific heat data, we determined the cubic crystalline electric field (CEF) parameters, the magnetic exchange constant, and the hyperfine coupling constant between the 4f magnetic moment and the 165Ho nuclear spin. Our results show that the Gamma5 CEF ground state is split by the hyperfine coupling, with an energy width of 1.3 K at 0 T, and that the true paramagnetic ground state is a quasi-sextet arising primarily from entanglement between the f-electron effective spin S = 1 and the 165Ho nuclear spin I = 7/2. We further demonstrate that, depending on the CEF parameters, the paramagnetic ground state can switch to an electron-nuclear coupled dectet. These findings underscore the importance of accurately identifying the electron-nuclear level scheme for understanding the low-temperature properties of rare-earth compounds containing spin-active nuclei. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_21158 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Paramagnetic electron-nuclear spin entanglement in HoCo2Zn20 Kitazawa, Takafumi Shimura, Yasuyuki Onimaru, Takahiro Tsuchida, Shun Kubo, Katsunori Haga, Yoshinori Sakai, Hironori Tokiwa, Yoshifumi Kambe, Shinsaku Tokunaga, Yo Strongly Correlated Electrons We investigated electron-nuclear spin entanglement in the paramagnetic ground state of the Ho-based cubic compound HoCo2Zn20. From analyses of magnetization and specific heat data, we determined the cubic crystalline electric field (CEF) parameters, the magnetic exchange constant, and the hyperfine coupling constant between the 4f magnetic moment and the 165Ho nuclear spin. Our results show that the Gamma5 CEF ground state is split by the hyperfine coupling, with an energy width of 1.3 K at 0 T, and that the true paramagnetic ground state is a quasi-sextet arising primarily from entanglement between the f-electron effective spin S = 1 and the 165Ho nuclear spin I = 7/2. We further demonstrate that, depending on the CEF parameters, the paramagnetic ground state can switch to an electron-nuclear coupled dectet. These findings underscore the importance of accurately identifying the electron-nuclear level scheme for understanding the low-temperature properties of rare-earth compounds containing spin-active nuclei. |
| title | Paramagnetic electron-nuclear spin entanglement in HoCo2Zn20 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2510.21158 |