期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 523, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2020.167539
关键词
Oxide with high concentrations of rare-earth elements; Van Vleck paramagnet; Magnetic quasi-doublet; Magnetic entropy change; High temperature of maximum magnetic entropy change
资金
- JST-Mirai Program, Japan [JPMJMI18A3]
- National Institute for Materials Science (NIMS) [PF2050]
This study reports on the magnetic properties of isostructural oxides with high concentrations of rare-earth elements, showing different magnetic behaviors and ground states among the different oxides.
We report on the magnetic properties of isostructural oxides R(6)AO(12) (R = a rare-earth element, A = Mo or W) with high concentrations of rare-earth elements. We measured the magnetization and specific heat. Tm6MoO12 is a van Vleck paramagnet with a nonmagnetic singlet ground state (GS). Ho6WO12 exhibits an antiferromagnetic long-range order (AFM LRO) lower than T-N = 2.1 K and its GS is a magnetic quasi-doublet. Dy6WO12 shows an AFM LRO lesser than T-N = 2.7 K and its GS is a magnetic Kramers doublet. Er6MoO12 and Er6WO12 are Curie-Weiss paramagnets at temperatures above 2 K and both have a magnetic Kramers doublet GS. We evaluated the magnetic entropy change. The temperature of the maximum magnetic entropy change for a magnetic-field change of 5 T is high (15 K) in Tm6MoO12 in spite of an oxide containing only rare-earth ions as the magnetic ions.
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