Structural, dielectric, antiferromagnetic, and thermal properties of the frustrated hexagonal Ho1-xErxMnO3 manganites
Structural, dielectric, antiferromagnetic, and thermal properties of the frustrated hexagonal Ho1-xErxMnO3 manganites
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DOI：
10.1103/physrevb.83.144404
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发表时间：
2011-04
影响因子：
3.7
通讯作者：
Peng Liu;Xiaolin Wang;Zhenxiang Cheng;Y. Du;H. Kimura
中科院分区：
文献类型：
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作者：
Peng Liu;Xiaolin Wang;Zhenxiang Cheng;Y. Du;H. Kimura
通过Rietveld精细化和介电常数、铁电磁滞回线、磁化率和比热的测量，研究了铒掺杂对固态法合成的六方HoErMnO（0≤1）化合物的结构、介电、铁电、磁性和热性能的影响。晶格参数随着铒含量的增加而减小，而晶格参数几乎保持不变，波动很小。电介质数据和铁电磁滞回线表明，所有样品不仅是具有漏性的铁电材料，而且具有与氧空位有关的介电弛豫。随着Er含量的增加，这些化合物的磁化强度逐渐降低。在mn -正交双锥体晶体场中，每个样品中的金属子都保持稳定的高自旋态。比热测量表明，反铁磁转变温度从homno2的72 K持续上升到ErMnO的76 K。ermno的德拜温度为381 K， HoMnO的德拜温度为422 K。
The Er doping effects on the structural, dielectric, ferroelectric, magnetic, and thermal properties of the hexagonal HoErMnO(0 ⩽⩽ 1) compounds synthesized by the solid-state reaction method have been investigated by Rietveld refinement and by measurements of dielectric constant, ferroelectric hysteresis loops, magnetic susceptibility, and specific heat. Thelattice parameter decreases as the Er content increases, whereas thelattice parameter nearly keeps constant with pretty minor fluctuations. Dielectric data and ferroelectric hysteresis loops show all the samples are not only ferroelectric materials with leaky nature, but also with dielectric relaxation related to oxygen vacancies. The magnetizations of these compounds gradually decrease with increasing Er content. The Mnions in each sample remain stable in the high-spin state in the Mn-Otrigonal bipyramidal crystal field. Specific heat measurements show that the antiferromagnetic transition temperature continuously rises from 72 K for HoMnOto 76 K for ErMnO. The Debye temperatures are 381 K for ErMnOand 422 K for HoMnO.