Long range electronic phase separation in CaFe(3)O(5).
Long range electronic phase separation in CaFe(3)O(5).
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DOI：
10.1038/s41467-018-05363-6
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发表时间：
2018-07-30
影响因子：
16.6
通讯作者：
Attfield JP
中科院分区：
文献类型：
--
作者：
Hong KH;Arevalo-Lopez AM;Cumby J;Ritter C;Attfield JP
锰氧化物钙钛矿从铁磁性到电荷有序状态的不完全转变导致了表现出巨大磁阻的相分离微结构。然而，目前还不清楚电子物质是否会自发分离成不同于高温状态的多个相。在302 K下，顺磁性CaFe_3O_5在其联合磁化转变处经历了两个不同电子和自旋顺序的相分离，一个相是电荷、轨道和三聚体有序，类似于磁铁矿Fe_3O_4基态，而另一个相是Fe~(2+)/Fe~(3+)电荷平均。晶格对称性没有变化，但来自电子有序的不同应变可能驱动了相分离。复杂的低对称性材料，如CaFe3O5，电荷可以在不同的阳离子位置之间重新分配，这为电子相分离纳米结构的产生和控制提供了可能性。电子相分离是许多相关钙钛矿化合物的重要特征，但在其他具有类似物理行为的复合氧化物中尚未见过，如磁铁矿。Hong等人在CaFe3O5中发现了类磁铁矿电荷有序相和电荷平均相之间的相分离。
Incomplete transformations from ferromagnetic to charge ordered states in manganite perovskites lead to phase-separated microstructures showing colossal magnetoresistances. However, it is unclear whether electronic matter can show spontaneous separation into multiple phases distinct from the high temperature state. Here we show that paramagnetic CaFe3O5 undergoes separation into two phases with different electronic and spin orders below their joint magnetic transition at 302 K. One phase is charge, orbital and trimeron ordered similar to the ground state of magnetite, Fe3O4, while the other has Fe2+/Fe3+charge averaging. Lattice symmetry is unchanged but differing strains from the electronic orders probably drive the phase separation. Complex low symmetry materials like CaFe3O5 where charge can be redistributed between distinct cation sites offer possibilities for the generation and control of electronic phase separated nanostructures. Electronic phase separation is an important feature of many correlated perovskite compounds but hasn’t been seen in other complex oxides with similar physical behaviour such as magnetite. Hong et al. find phase separation between a magnetite-like charge ordered phase and a charge averaged phase in CaFe3O5.
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影响因子：
1.4
作者：
Hong, Ka H.;McNally, Graham M.;Attfield, J. Paul
通讯作者：
Attfield, J. Paul
影响因子：
6.1
作者：
Brown, ID
通讯作者：
Brown, ID
影响因子：
3.5
作者：
Attfield, J. Paul
通讯作者：
Attfield, J. Paul
影响因子：
8.6
作者：
Woodward, PM;Cox, DE;Cheetham, AK
通讯作者：
Cheetham, AK
影响因子：
8.6
作者：
Magen, C;Algarabel, PA;Sousa, JB
通讯作者：
Sousa, JB