Polymorphism and Magnetism in a Kitaev Honeycomb Cobaltate KCoAsO$_4$

Yuya Haraguchi; Daisuke-Nishio Hamane; Hiroko Aruga Katori

doi:10.1038/s41598-025-86302-6

Polymorphism and Magnetism in a Kitaev Honeycomb Cobaltate KCoAsO$_4$

Strongly Correlated Electrons 2025-01-29 v1 Materials Science

Authors: Yuya Haraguchi , Daisuke-Nishio Hamane , Hiroko Aruga Katori

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Abstract

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.

Keywords

Kitaev honeycomb cobaltate polymorphism magnetism crystal structure magnetic ordering phase diagram

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@article{arxiv.2501.05146,
  title  = {Polymorphism and Magnetism in a Kitaev Honeycomb Cobaltate KCoAsO$_4$},
  author = {Yuya Haraguchi and Daisuke-Nishio Hamane and Hiroko Aruga Katori},
  journal= {arXiv preprint arXiv:2501.05146},
  year   = {2025}
}

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16 pages, 5 figures

Polymorphism and Magnetism in a Kitaev Honeycomb Cobaltate KCoAsO$_4$

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