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Double Double Cation Order in the High‐Pressure Perovskites MnRMnSbO 6
Author(s) -
SolanaMadruga Elena,
ArévaloLópez Ángel M.,
Dos SantosGarcía Antonio J.,
UronesGarrote Esteban,
ÁvilaBrande David,
SáezPuche Regino,
Attfield J. Paul
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201603526
Subject(s) - ferrimagnetism , tetragonal crystal system , monoclinic crystal system , spins , perovskite (structure) , magnetoresistance , crystallography , condensed matter physics , order (exchange) , chemistry , materials science , crystal structure , magnetization , physics , magnetic field , finance , quantum mechanics , economics
Cation ordering in ABO 3 perovskites adds to their chemical variety and can lead to properties such as ferrimagnetism and magnetoresistance in Sr 2 FeMoO 6 . Through high‐pressure and high‐temperature synthesis, a new type of “double double perovskite” structure has been discovered in the family MnRMnSbO 6 (R=La, Pr, Nd, Sm). This tetragonal structure has a 1:1 order of cations on both A and B sites, with A‐site Mn 2+ and R 3+ cations ordered in columns and Mn 2+ and Sb 5+ having rock salt order on the B sites. The MnRMnSbO 6 double double perovskites are ferrimagnetic at low temperatures with additional spin‐reorientation transitions. The ordering direction of ferrimagnetic Mn spins in MnNdMnSbO 6 changes from parallel to [001] below T C =76 K to perpendicular below the reorientation transition at 42 K at which Nd moments also order. Smaller rare earths lead to conventional monoclinic double perovskites (MnR)MnSbO 6 for Eu and Gd.