Simultaneous Measurements of Magnetic Neutron Diffraction, Electrical Polarization and Permittivity of Multiferroic ErMn2O5
Simultaneous Measurements of Magnetic Neutron Diffraction, Electrical Polarization and Permittivity of Multiferroic ErMn2O5
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同时测量多铁性 ErMn2O5 的磁中子衍射、电极化和介电常数
DOI：
10.1143/jpsj.76.074710
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发表时间：
2007
影响因子：
1.7
通讯作者：
K. Kohn
中科院分区：
文献类型：
--
作者：
M. Fukunaga;K. Nishihata;H. Kimura;Y. Noda;K. Kohn
为了确定多铁性稀土锰氧化物中磁有序和铁电性之间的确切关系，我们同时测量了2.5K以下ErMn 2 O 5的中子衍射、铁电D-E磁滞回线和介电常数e。特别注意的是铁电相变温度附近的区域。与先前基于单独测量的预期相反，发现e的峰值与磁Increasate相称的相变相吻合。然而，它被证实，电极化出现在过渡到一维无公度磁相，这是高于峰值的e由1.2 K。发现了ErMn 2 O 5在8 K以下的低温无公度磁性相，根据D-E环，最低温度相似乎是顺电相，而热释电测量表明该相具有小的极化。
In order to determine an exact relationship between magnetic ordering and ferroelectricity in multiferroic rare-earth manganese oxides, we have performed simultaneous measurements of neutron diffraction, ferroelectric D – E hysteresis loops and the permittivity e of ErMn 2 O 5 down to 2.5 K. Special attention was paid to the area around the ferroelectric phase transition temperature. In contrast to previous expectations based on separate measurements, the peak of e was found to coincide with a magnetic incommensurate–commensurate phase transition. However, it was confirmed that electrical polarization appears at the transition to a one-dimensionally incommensurate magnetic phase, which is higher than the peak of e by 1.2 K. A previously unknown low-temperature incommensurate magnetic phase of ErMn 2 O 5 below 8 K was found. The lowest-temperature phase appears to be paraelectric according to the D – E loops, while pyroelectric measurements show that the phase exhibits a small polarization.