Complex Ferrimagnetism and Magnetoresistance Switching in Ca-Based Double Double and Triple Double Perovskites
Complex Ferrimagnetism and Magnetoresistance Switching in Ca-Based Double Double and Triple Double Perovskites
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DOI：
10.1021/acs.chemmater.7b03556
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发表时间：
2017-10-24
影响因子：
8.6
通讯作者：
Attfield, J. Paul
中科院分区：
文献类型：
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作者：
McNally, Graham M.;Arevalo-Lopez, Angel M.;Attfield, J. Paul
ABO(3)钙钛矿中的阳离子有序可以通过Sr2FeMoO6的自旋极化传导导致铁磁性和高磁阻等有趣和有用的现象。我们在高压和高温下合成了阳离子有序的AA'BB'O-6钙钛矿CaMn-FeReO6、CaMnMnReO6和Ca(Mn0.5Cu0.5)FeReO6。它们具有柱状A/A‘和岩盐B/B’阳离子顺序，如最近发现的双双钙钛矿MriNdMnSbO(6)中所发现的，Ca(Mn0.5Cu0.5) feeo6中四面体和正方形平面A'位上的部分Mn/Cu顺序表明可能存在三双阳离子顺序。中子衍射揭示了这三种材料中复杂的铁磁序；CaMnMnReO6和Ca(Mn0.5Cu0.5)FeReO6具有较大的室温磁化强度，后者材料的磁阻在低温下切换，CaMnMnReO6在低温下显示出1.3 T的高矫顽力。
Cation ordering in ABO(3) perovskites can lead to interesting and useful phenomena such as ferrimagnetism and high magnetoresistance by spin polarized conduction in Sr2FeMoO6. We used high pressures and temperatures to synthesize the cation ordered AA'BB'O-6 perovskites CaMn-FeReO6, CaMnMnReO6, and Ca(Mn0.5Cu0.5)FeReO6. These have columnar A/A' and rocksalt B/B' cation orders, as found in the recently discovered double double perovskite MriNdMnSbO(6), and partial Mn/Cu order over tetrahedral and square planar A' sites in Ca(Mn0.5Cu0.5)FeReO6 demonstrates that triple double cation order is possible. Neutron diffraction reveals complex ferrimagnetic orders in all three materials; CaMnFeReO6 and Ca(Mn0.5Cu0.5)FeReO6 have large room temperature magnetizations with low temperature switching of magnetoresistance in the latter material, and CaMnMnReO6 displays a high coercivity of 1.3 T at low temperatures.