Polymorphism and Magnetism in a Kitaev Honeycomb Cobaltate KCoAsO$_4$
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916586283073536 |
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| author | Haraguchi, Yuya Hamane, Daisuke-Nishio Katori, Hiroko Aruga |
| author_facet | Haraguchi, Yuya Hamane, Daisuke-Nishio Katori, Hiroko Aruga |
| contents | We report the synthesis, crystal structure, and magnetic properties of a new Kitaev honeycomb cobaltate, KCoAsO$_4$, which crystallizes in two distinct forms: $P2/c$ and $R\bar{3}$ space groups. Magnetic measurements reveal ordering temperatures of $\sim$14 K for the $P2/c$ structure and $\sim$10.5 K for the $R\bar{3}$ structure. The $P2/c$-type KCoAsO$_4$ sample exhibits a complex temperature-field phase diagram, including a field-induced phase, while the $R\bar{3}$-type KCoAsO$_4$ shows a simpler phase diagram with a single magnetically ordered phase. The observed differences in magnetic properties are attributed to subtle structural variations, strongly suggesting that local structural changes play a crucial role in determining the magnetism of cobaltate-based Kitaev materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_05146 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Polymorphism and Magnetism in a Kitaev Honeycomb Cobaltate KCoAsO$_4$ Haraguchi, Yuya Hamane, Daisuke-Nishio Katori, Hiroko Aruga Strongly Correlated Electrons Materials Science We report the synthesis, crystal structure, and magnetic properties of a new Kitaev honeycomb cobaltate, KCoAsO$_4$, which crystallizes in two distinct forms: $P2/c$ and $R\bar{3}$ space groups. Magnetic measurements reveal ordering temperatures of $\sim$14 K for the $P2/c$ structure and $\sim$10.5 K for the $R\bar{3}$ structure. The $P2/c$-type KCoAsO$_4$ sample exhibits a complex temperature-field phase diagram, including a field-induced phase, while the $R\bar{3}$-type KCoAsO$_4$ shows a simpler phase diagram with a single magnetically ordered phase. The observed differences in magnetic properties are attributed to subtle structural variations, strongly suggesting that local structural changes play a crucial role in determining the magnetism of cobaltate-based Kitaev materials. |
| title | Polymorphism and Magnetism in a Kitaev Honeycomb Cobaltate KCoAsO$_4$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2501.05146 |