Abstract
The structural, transport, and magnetic properties of the naturally layered manganese oxide, Sr 1.6Sm 1.4Mn 2O 7 (Sm-327), which consists of two [MnO 2] bi-layers intertwined with a rock-salt type layer of [(Sr,Sm) 2O 2] have been investigated. Both a sharp metal–insulator (M–I) transition and an antiferromagnetic transition were found to occur simultaneously at about 118 K. Even in the absence of ferromagnetic ordering the resistance is suppressed remarkably upon applying a magnetic field. These results suggest that the M–I transition and colossal magnetoresistance behavior observed in Sm-327 are not driven mainly by the double exchange mechanism but ascribed rather to the canted antiferromagnetic spin configurations of [MnO 2] bi-layers, which eventually leads to the field-induced ferromagnetic ordering.
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