Mg和Zn取代对多铁反铁磁体MnWO4相竞争的影响
Effect of nonmagnetic substituents Mg and Zn on the phase competition in the multiferroic antiferromagnet MnWO4
摘要：
研究了Mg 2+和Zn 2+离子取代Mn 2+（S = 5/2）对多铁性阻挫反铁磁体MnWO 4的结构、磁性和介电性能的影响。采用固相法制备了Mn 1-xMgxWO 4和Mn 1-xZnxWO 4（0<x<0.3）固溶体多晶样品，并通过X射线衍射、中子衍射、磁化强度和介电常数测量对其进行了表征。Mg和Zn的替代产生非常相似的效果。MnWO 4的Neel温度TN、AF 3-到AF 2的磁相变温度T2和临界铁电温度Tc = T2在掺杂后降低。在最低温度（T = 1.5 K），无公度的磁性结构为x（Mg）= 0.15和x（Zn）= 0.15对应于一个正弦的自旋排列或椭圆形的自旋螺旋相类似的极性AF 2结构中观察到MnWO 4。这些发现进行了讨论，考虑的Mg和Zn取代的晶格和MnWO 4的自旋交换网络的影响。
英文摘要：
The effects of substituting nonmagnetic Mg2+ and Zn2+ ions for the Mn2+ (S = 5/2) ions on the structural, magnetic and dielectric properties of the multiferroic frustrated antiferromagnet MnWO4 were investigated. Polycrystalline samples of Mn1-xMgxWO4 and Mn1-xZnxWO4 (0<x<0.3) solid solutions were prepared by a solid-state route and characterized via X-ray and neutron diffraction, magnetization, and dielectric permittivity measurements. Mg and Zn substitutions give rise to very similar effects. The Neel temperature TN, the AF3-to-AF2 magnetic phase transition temperature T2, and the critical ferroelectric temperature Tc = T2 of MnWO4 are reduced upon the nonmagnetic doping. At the lowest temperature (T = 1.5 K), the incommensurate magnetic structure for x(Mg) = 0.15 and x(Zn) = 0.15 corresponds to either a sinusoidal spin arrangement or an elliptical spin-spiral phase similar to the polar AF2 structure observed in MnWO4. These findings were discussed by considering the effects of the Mg and Zn substitutions on the crystal lattice and on the spin exchange network of MnWO4.
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