Absence of long-range V-V dimer and magnetic orderings in high-entropy (Mg $_{0.2}$ Mn $_{0.2}$ Co $_{0.2}$ Ni $_{0.2}$ Cu $_{0.2}$ )VO

Yamamoto, Hajime*; Tsuji, Takuya; Matsumura, Daiju; 16 of others*

V-V dimerization in ilmenite-type vanadium oxides is an intriguing phenomenon that induces structural and metal-to-insulator transitions. Herein, we report the high-pressure synthesis, crystal structure, and electronic states of high-entropy ilmenite-type (Mg $_{0.2}$ Mn $_{0.2}$ Co $_{0.2}$ Ni $_{0.2}$ Cu $_{0.2}$ )VO. Although all the parent ilmenite-type compounds exhibit triclinic () symmetry, this compound crystallizes in a rhombohedral () structure, indicating the absence of V-V dimer ordering. The temperature dependence of the resistivity below room temperature follows a variable-range hopping conduction mechanism, suggesting the presence of short-range V-V dimer ordering. Magnetic susceptibility and heat capacity measurements revealed multi-step spin-glass transitions. This study demonstrates that a high-entropy composition hinders electronic and magnetic long-range ordering due to severe lattice distortions and competition between magnetic exchange interactions.

発表言語	:	English
掲載資料名	:	Inorganic Chemistry
巻	:	64
号	:	34
ページ数	:	p.17496 - 17502
発行年月	:	2025/08
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キーワード	:	SPring-8; XAFS; High-entropy composition

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論文URL	:	https://doi.org/10.1021/acs.inorgchem.5c02779
研究データの公開先DOI	:	本成果にかかわる研究データのリンクです。
使用施設	:	SPring-8(大型放射光施設)
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登録番号 : AA20250383
抄録集掲載番号 : 54000026
論文投稿番号 : 30330

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Absence of long-range V-V dimer and magnetic orderings in high-entropy (MgMnCoNiCu)VO

Absence of long-range V-V dimer and magnetic orderings in high-entropy (Mg $_{0.2}$ Mn $_{0.2}$ Co $_{0.2}$ Ni $_{0.2}$ Cu $_{0.2}$ )VO