期刊
PHYSICAL REVIEW B
卷 105, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.105.094408
关键词
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资金
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-07CH11358]
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office
- U.S. Department of Energy, Office of Basic Energy Sciences, Scientific Users Facilities Division
- Danish Agency for Science and Higher Education
- Polish National Agency for Academic Exchange under the 'Polish Returns 2019' programme [PPN/PPO/2019/1/00014]
- Ministry of Science and Higher Education
- Science and Technology Facilities Council
Neutron diffraction, magnetization, and muon spin relaxation measurements, supplemented by density functional theory (DFT) calculations, have been used to unravel temperature-driven magnetization reversal in inverse spinel Co2VO4. It is found that there is a second-order magnetic phase transition at 168 K to a collinear ferrimagnetic phase. Neutron diffraction measurements reveal the presence of two antiparallel ferromagnetic (FM) sublattices, and the evolution of the ordered moment with temperature leads to a reversal of the net magnetic moment at 65 K. DFT results suggest that this reversal is due to a delocalization-localization crossover of the unfilled 3d-shell electrons on one sublattice.
Neutron diffraction, magnetization, and muon spin relaxation measurements, supplemented by density functional theory (DFT) calculations are employed to unravel temperature-driven magnetization reversal in inverse spinel Co2VO4. All measurements show a second-order magnetic phase transition at T-C = 168 K to a collinear ferrimagnetic phase. Neutron diffraction measurements reveal two antiparallel ferromagnetic (FM) sublattices, belonging to magnetic ions on two distinct crystal lattice sites, where the relative balance between the two sublattices determine the net FM moment in the unit cell. As the evolution of the ordered moment with temperature differs between the two sublattices, the net magnetic moment reaches a maximum at T-NC = 138 K and reverses its sign at T-MR = 65 K. The DFT results suggest that the underlying microscopic mechanism for the reversal is a delocalization of the unfilled 3d-shell electrons on one sublattice just below T-C, followed by a gradual localization as the temperature is lowered. This delocalized-localized crossover is supported by muon spectroscopy results, as strong T-1 relaxation observed below T-C indicates fluctuating internal fields.
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