Magnetism driven ferroelectricity above liquid nitrogen temperature in Y2CoMnO6
Magnetism driven ferroelectricity above liquid nitrogen temperature in Y2CoMnO6
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DOI：
10.1063/1.4812728
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发表时间：
2013-03
影响因子：
4
通讯作者：
Gyaneshwar Sharma;J. Saha;S. Kaushik;V. Siruguri;S. Patnaik
中科院分区：
文献类型：
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作者：
Gyaneshwar Sharma;J. Saha;S. Kaushik;V. Siruguri;S. Patnaik
我们报告了铁电转变温度 Tc = 80 K 的双钙钛矿 Y2CoMnO6 的多铁性行为。X 射线衍射和中子散射数据证实了室温下空间群 P21/n 的中心对称晶体结构。饱和极化和磁化强度估计为 65 μC/m2 和 6.2 μB/f.u。分别。另一方面，磁电耦合参数很小，因为 5 T 场仅抑制电极化~8%。铁电性的起源与 Co2+ 和 Mn4+ 磁矩在 ↑↑-↓↓ 排列中的磁序有关。提出了一种基于交换严格的模型来解释观察到的高温铁电性。
We report multiferroic behaviour in double perovskite Y2CoMnO6 with ferroelectric transition temperature Tc = 80 K. Both X-ray diffraction and neutron scattering data confirm a centro-symmetric crystal structure of space group P21/n at room temperature. The saturation polarization and magnetization are estimated to be 65 μC/m2 and 6.2 μB/f.u. respectively. The magneto-electric coupling parameter, on the other hand, is small as a 5 T field suppresses the electric polarization by only ∼8%. The origin of ferroelectricity is associated with magnetic ordering of Co2+ and Mn4+ moments in ↑↑-↓↓ arrangement. A model based on exchange-striction is proposed to explain the observed high temperature ferroelectricity.