Double Double Cation Order in the High-Pressure Perovskites MnRMnSbO6
Double Double Cation Order in the High-Pressure Perovskites MnRMnSbO6
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DOI：
10.1002/anie.201603526
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发表时间：
2016-08-01
影响因子：
16.6
通讯作者：
Attfield, J. Paul
中科院分区：
文献类型：
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作者：
Solana-Madruga, Elena;Arevalo-Lopez, Angel M.;Attfield, J. Paul
ABO（3）钙钛矿中的阳离子有序增加了它们的化学多样性，并可导致Sr2FeMoO6中的亚铁磁性和磁阻等性质。通过高压高温合成，在MnRMnSbO_6（R= La，Pr，Nd，Sm）族中发现了一种新型的“双双钙钛矿”结构。该四配位结构在A和B位点上具有1：1的阳离子顺序，其中A位点Mn 2+和R3+阳离子在柱中有序，并且Mn 2+和Sb 5+在B位点上具有岩盐顺序。MnRMnSbO6双双钙钛矿在低温下具有亚铁磁性，并具有额外的自旋重取向转变。MnNdMnSbO_6中的亚铁磁Mn自旋的有序方向在T_C = 76 K以下从平行于[001]变为垂直于42 K下的重取向转变，在42 K下Nd磁矩也是有序的。对于Eu和Gd，较小的稀土导致常规的单斜双钙钛矿（MnR）MnSbO6。
Cation ordering in ABO(3) perovskites adds to their chemical variety and can lead to properties such as ferrimagnetism and magnetoresistance in Sr2FeMoO6. Through highpressure and high-temperature synthesis, a new type of "double double perovskite" structure has been discovered in the family MnRMnSbO6 (R= La, Pr, Nd, Sm). This tetragonal structure has a 1: 1 order of cations on both A and B sites, with A-site Mn2+ and R3+ cations ordered in columns and Mn2+ and Sb5+ having rock salt order on the B sites. The MnRMnSbO6 double double perovskites are ferrimagnetic at low temperatures with additional spin-reorientation transitions. The ordering direction of ferrimagnetic Mn spins in MnNdMnSbO6 changes from parallel to [001] below T-C= 76 K to perpendicular below the reorientation transition at 42K at which Nd moments also order. Smaller rare earths lead to conventional monoclinic double perovskites (MnR)MnSbO6 for Eu and Gd.