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首页> 外文期刊>Acta Crystallographica, Section B. Structural science, crystal engineering and materials >Crystal and magnetic structures of hexagonal YMnO_3
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Crystal and magnetic structures of hexagonal YMnO_3

机译：六角形YMnO_3的晶体和磁性结构

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摘要

The available data on the structural and magnetic transitions in multiferroic hexagonal YMn03 have been reviewed, first making use of the computer programs from the group theoretical ISOTROPY software suite to list possible crystal and magnetic structures, then taking into account the capability of neutron diffraction and other physical methods to distinguish them. This leads to a clear view of the transformation sequence, as follows. Hexagonal YMn03 is paraelectric in F6_3/mmc at elevated temperatures, and undergoes a single structural transition on cooling through 1250 K to a ferrielectric phase in P6_3cm that is retained through room temperature. At a much lower temperature, 70 K, there is a magnetic transition from paramagnetic to a triangular antiferromagnetic arrangement, most likely with symmetry P6_3'cm'. Comment is made on the unusual coupling of ferroelectric and magnetic domains reported to occur in this material, as well as on the so-called 'giant magneto-elastic, effect.
机译：审查了有关多铁六角形YMn03中结构和磁跃迁的可用数据，首先使用了理论ISOTROPY组软件套件中的计算机程序列出了可能的晶体和磁结构，然后考虑了中子衍射和其他方面的能力。区分它们的物理方法。这样可以清楚地看到转换序列，如下所示。六边形的YMn03在升高的温度下为F6_3 / mmc顺电，在通过1250 K冷却至P6_3cm的亚铁电相时经历一次结构转变，并在室温下保留。在更低的温度70 K下，存在从顺磁性到三角反铁磁性排列的磁跃迁，最有可能具有对称性P6_3'cm'。人们对据报道在这种材料中发生的铁电和磁畴的异常耦合以及所谓的“巨大磁弹性”效应做出了评论。

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