High-pressure effect on the crystal and magnetic structures of the frustrated antiferromagnet YMnO3
High-pressure effect on the crystal and magnetic structures of the frustrated antiferromagnet YMnO3
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DOI：
10.1134/1.2121813
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发表时间：
2005-08
期刊：
影响因子：
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通讯作者：
D. Kozlenko;S. Kichanov;S. Lee;J. Park;V. Glazkov;B. Savenko
中科院分区：
文献类型：
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作者：
D. Kozlenko;S. Kichanov;S. Lee;J. Park;V. Glazkov;B. Savenko
The high-pressure (to 5 GPa) effect on the crystal and magnetic structures of the hexagonal manganite YMnO3is studied by neutron diffraction in the temperature range 10–295 K. A spin-liquid state due to magnetic frustration on the triangular lattice formed by Mn ions is observed in this compound at normal pressure andT>TN= 70 K, and an ordered triangular antiferromagnetic state with the symmetry of the irreducible representation Γ1arises atT<TN. The high-pressure effect leads to a spin reorientation of Mn magnetic moments and a change in the symmetry of the antiferromagnetic structure, which can be described by a combination of the irreducible representations Γ1and Γ2. In addition, it is observed that the ordered magnetic moment of Mn ions decreases from 3.27 μB(5 GPa) to 1.52 μB(5 GPa) atT= 10 K and diffuse scattering is enhanced at temperatures close toTN. These effects can be explained within the model of the coexistence of the ordered antiferromagnetic phase and the spin-liquid state, whose volume fraction increases with pressure due to the enhancement of frustration effects.
