Emergence of a Magnetostructural Dipolar Glass in the Quadruple Perovskite Dy_{1-δ}Mn_{7+δ}O_{12}.
Emergence of a Magnetostructural Dipolar Glass in the Quadruple Perovskite Dy_{1-δ}Mn_{7+δ}O_{12}.
复制标题
四重钙钛矿 Dy_{1-δ}Mn_{7+δ}O_{12} 中磁结构偶极玻璃的出现。
DOI：
10.1103/physrevlett.125.097601
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发表时间：
2020
影响因子：
8.6
通讯作者：
A. Belik
中科院分区：
文献类型：
--
作者：
R. D. Johnson;D. Khalyavin;P. Manuel;L. Zhang;K. Yamaura;A. Belik
结果表明，四元钙钛矿Dy_(1-δ)Mn_(7+δ)O_(12)中欠键合的稀土A位阳离子存在着极化伪Jahn-Teller不稳定性，导致偶极玻璃的自发形成。仅这一观察就扩展了伪扬-泰勒物理在钙钛矿衍生材料中的适用性，对于钙钛矿衍生材料，它通常被限制在B位阳离子。我们证明了偶极玻璃序参数通过应变耦合到亚铁磁序参数，导致了可以通过磁场调谐的一阶磁结构相变。这一现象可能出现在广泛的钙钛矿衍生材料中，其中A位阳离子有序化和八面体倾斜相互联系以满足结构稳定性的标准。
We show that a polar, pseudo-Jahn-Teller instability exists for the underbonded rare-earth A-site cations in the quadruple perovskite Dy_{1-δ}Mn_{7+δ}O_{12}, which leads to the spontaneous formation of a dipolar glass. This observation alone expands the applicability of pseudo-Jahn-Teller physics in perovskite-derived materials, for which it is typically confined to B-site cations. We demonstrate that the dipolar glass order parameter is coupled to a ferrimagnetic order parameter via strain, leading to a first order magnetostructural phase transition that can be tuned by magnetic field. This phenomenology may emerge in a broad range of perovskite-derived materials in which A-site cation ordering and octahedral tilting are mutually tied to meet the criteria of structural stability.
影响因子：
16.6
作者：
Zhang, Wen;Cai, Ying;Awaga, Kunio
通讯作者：
Awaga, Kunio