$J_{\rm{eff}}$ = 1/2 Hyperoctagon Lattice in Cobalt Oxalate Metal-Organic-Framework
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866917636140433408 |
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| author | Ishikawa, Hajime Imajo, Shusaku Takeda, Hikaru Kakegawa, Masafumi Yamashita, Minoru Yamaura, Jun-ichi Kindo, Koichi |
| author_facet | Ishikawa, Hajime Imajo, Shusaku Takeda, Hikaru Kakegawa, Masafumi Yamashita, Minoru Yamaura, Jun-ichi Kindo, Koichi |
| contents | We report the magnetic properties of a cobalt oxalate metal-organic-framework featuring the hyperoctagon lattice. Our thermodynamic measurements reveal the $J_{\rm{eff}}$ = 1/2 state of the high-spin Co$^{2+}$ (3$\textit{d}^{7}$) ion and the two successive magnetic transitions at zero field with two-stage entropy release. $^{13}$C-NMR measurements reveal the absence of an internal magnetic field in the intermediate temperature phase. Multiple field-induced phases are observed before full saturation at around 40 T. We argue the unique cobalt oxalate network gives rise to the Kitaev interaction and/or a bond frustration effect, providing an unconventional platform for frustrated magnetism on the hyperoctagon lattice. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_06923 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | $J_{\rm{eff}}$ = 1/2 Hyperoctagon Lattice in Cobalt Oxalate Metal-Organic-Framework Ishikawa, Hajime Imajo, Shusaku Takeda, Hikaru Kakegawa, Masafumi Yamashita, Minoru Yamaura, Jun-ichi Kindo, Koichi Strongly Correlated Electrons Materials Science We report the magnetic properties of a cobalt oxalate metal-organic-framework featuring the hyperoctagon lattice. Our thermodynamic measurements reveal the $J_{\rm{eff}}$ = 1/2 state of the high-spin Co$^{2+}$ (3$\textit{d}^{7}$) ion and the two successive magnetic transitions at zero field with two-stage entropy release. $^{13}$C-NMR measurements reveal the absence of an internal magnetic field in the intermediate temperature phase. Multiple field-induced phases are observed before full saturation at around 40 T. We argue the unique cobalt oxalate network gives rise to the Kitaev interaction and/or a bond frustration effect, providing an unconventional platform for frustrated magnetism on the hyperoctagon lattice. |
| title | $J_{\rm{eff}}$ = 1/2 Hyperoctagon Lattice in Cobalt Oxalate Metal-Organic-Framework |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2404.06923 |