Strong magnetic-dielectric-lattice coupling in transition metal hydroxyhalides and ferroelectric response in rhombohedral Co2(OD) 3X (X=Cl, Br)
Strong magnetic-dielectric-lattice coupling in transition metal hydroxyhalides and ferroelectric response in rhombohedral Co2(OD) 3X (X=Cl, Br)
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DOI：
10.1103/physrevb.87.174102
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发表时间：
2013-05
影响因子：
3.7
通讯作者：
Xu-Guang Zheng;M. Fujihala;S. Kitajima;M. Maki;K. Kato;M. Takata;Chao‐Nan Xu
中科院分区：
文献类型：
--
作者：
Xu-Guang Zheng;M. Fujihala;S. Kitajima;M. Maki;K. Kato;M. Takata;Chao‐Nan Xu
${M}_{2}$(OH)${}_{3}X$ 和 $M$(OH)$X$ 类型的羟基盐（其中 $M$ 代表过渡金属离子，$X$ 代表卤素离子）广泛作为矿物存在，最近被报道为几何挫败磁体。在这里，我们报告了它们中铁电响应的发现。首先，我们观察到它们在低温磁转变过程中都存在强磁-晶格-介电耦合。其次，我们通过同位素效应在高晶体对称性的氘化羟基盐（即菱面体 Co${}_{2}$(OD)${}_{3}$Cl 和 Co${}_{2}$(OD)${}_{3}$Br）中通过同位素效应确定了在 220--230 K 高温下的明显铁电响应。目前的工作表明，多铁性可能是磁性羟基盐中潜在的普遍现象。同时，它提供了磁性几何挫败和氢键软模铁电体之间的第一个联系。
Hydroxyl salts of the type ${M}_{2}$(OH)${}_{3}X$, and $M$(OH)$X$, where $M$ represents a transition metal ion and $X$ represents a halogen ion, widely exist as minerals and were recently reported to be geometrically frustrated magnets. Here, we report the finding of ferroelectric response in them. First, we observed strong magnetic-lattice-dielectric couplings in all of them as witnessed during their magnetic transitions at low temperatures. Secondly, we identified apparent ferroelectric responses in the deuterated hydroxyl salts of high crystal symmetries, i.e., rhombohedral Co${}_{2}$(OD)${}_{3}$Cl and Co${}_{2}$(OD)${}_{3}$Br, at high temperatures of 220--230 K through an isotope effect. The present work shows that multiferroicity may be a potentially universal phenomenon in magnetic hydroxyl salts. Meanwhile, it provides the first link between magnetic geometric frustration and hydrogen-bonded soft-mode ferroelectrics.