绘制(Gd, Er)B4 固溶体单晶复杂磁结构的相图

Magnetism Pub Date : 2024-02-04 DOI:10.3390/magnetism4010002
Sueli H. Masunaga, V. Barbeta, Fábio Abud, Milton S. Torikachvili, Renato F. Jardim
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引用次数: 0

摘要

通过测量单晶体的比热和磁化率,绘制出了 Gd1-xErxB4 (x = 0.2 和 0.4)固溶体沿 c 轴的磁相图。GdB4 在 41.7 K 时反铁磁(AF)有序,易磁化面垂直于 c 轴,而 ErB4 则在 15.4 K 以下显示 AF 有序,易磁化轴沿着 c 轴。这些测量结果表明,只要用 40% 的 Er 取代 Gd,就足以产生与 ErB4 系统相图相似的相图,其特点是出现高原相和其他归因于相互竞争的磁各向异性相互作用的奇异特征。
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Phase Diagram Mapping out the Complex Magnetic Structure of Single Crystals of (Gd, Er)B4 Solid Solutions
Measurements of specific heat and magnetization in single crystals were used to map out the magnetic phase diagram of Gd1−xErxB4 (x = 0.2 and 0.4) solid solutions along the c-axis. While GdB4 orders antiferromagnetically (AF) at 41.7 K, with the easy plane of magnetization oriented perpendicularly to the c-axis, ErB4 displays AF ordering below 15.4 K, with the easy axis along c. Therefore, in solid solutions, the competition between the different spin anisotropies, as well as frustration, lead to a complex spin configuration. These measurements reveal that a 40% substitution of Er for Gd is sufficient for generating a phase diagram similar to the one for the ErB4 system, characterized by the occurrence of plateau phases and other exotic features attributed to the interplay of competing magnetic anisotropies.
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