Near-Room-Temperature Colossal Magnetodielectricity and Multiglass Properties in Partially Disordered La2NiMnO6
Near-Room-Temperature Colossal Magnetodielectricity and Multiglass Properties in Partially Disordered La2NiMnO6
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DOI：
10.1103/physrevlett.108.127201
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发表时间：
2012-03-19
影响因子：
8.6
通讯作者：
Sarma, D. D.
中科院分区：
文献类型：
--
作者：
Choudhury, D.;Mandal, P.;Sarma, D. D.
我们报告了部分无序 La2NiMnO6 的纯单斜体相的磁、介电和磁电介质响应，表现出一系列不寻常的特性，并确定该化合物是一种本质上的多玻璃系统，在较宽的温度范围 (150-300 K) 内具有较大的磁电介质耦合 (8%-20%)。具体来说，我们的结果建立了一种独特的方法，通过调节过渡金属氧化物系统中相邻磁性离子之间的相对自旋方向来设计不对称跳跃对介电常数的贡献，从而获得巨大的磁介电性，而不受任何严格效应的影响。我们讨论反位点（Ni-Mn）无序在这些不寻常特性的出现中的作用。
We report magnetic, dielectric, and magnetodielectric responses of the pure monoclinic bulk phase of partially disordered La2NiMnO6, exhibiting a spectrum of unusual properties and establish that this compound is an intrinsically multiglass system with a large magnetodielectric coupling (8%-20%) over a wide range of temperatures (150-300 K). Specifically, our results establish a unique way to obtain colossal magnetodielectricity, independent of any striction effects, by engineering the asymmetric hopping contribution to the dielectric constant via the tuning of the relative-spin orientations between neighboring magnetic ions in a transition-metal oxide system. We discuss the role of antisite (Ni-Mn) disorder in emergence of these unusual properties.