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Published on: July 3, 2015
Absence of Long-Range V-V Dimer and Magnetic Orderings in High-Entropy (Mg0.2Mn0.2Co0.2Ni0.2Cu0.2)VO3
Hajime Yamamoto1, Boxuan Li1, Hinako Telengut1
1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.
None:
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 and magnetic states of high-entropy ilmenite-type (Mg0.2Mn0.2Co0.2Ni0.2Cu0.2)VO3. Although all the parent ilmenite-type compounds exhibit triclinic (P1̅) symmetry at room temperature, this compound crystallizes in a rhombohedral (R3̅) structure, indicating the absence of long-range V-V dimer ordering. The presence of short-range ordering of the V-V dimer is predicted from the insulating property and crystal structure. Furthermore, magnetic susceptibility and heat capacity measurements revealed multiple-step spin-glass transitions. This study demonstrates that a high-entropy composition hinders electronic (V-V dimer) and magnetic long-range orderings due to local structural distortions and magnetic frustration.
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