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Updated: Jun 1, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Polymorphism and magnetism in a Kitaev honeycomb cobaltate KCoAsO4
Yuya Haraguchi1, Daisuke Nishio-Hamane2, Hiroko Aruga Katori3
1Department of Applied Physics and Chemical Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan. chiyuya3@go.tuat.ac.jp.
Abstract:
We report the synthesis, crystal structure, and magnetic properties of a new Kitaev honeycomb cobaltate, KCoAsO4, which crystallizes in two distinct forms: P2/c and R[Formula: see text] space groups. Magnetic measurements reveal ordering temperatures of ~ 14 K for the P2/c structure and ~ 10.5 K for the R[Formula: see text] structure. The P2/c-type KCoAsO4 sample exhibits a complex temperature-field phase diagram, including a field-induced phase, while the R[Formula: see text]-type KCoAsO4 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.
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