Giant Magnetoresistance in the Half-Metallic Double-Perovskite Ferrimagnet Mn2 FeReO6.

Angewandte Chemie (International ed. in English)

PubMedID: 26235744

Li MR, Retuerto M, Deng Z, Stephens PW, Croft M, Huang Q, Wu H, Deng X, Kotliar G, Sánchez-Benítez J, Hadermann J, Walker D, Greenblatt M. Giant Magnetoresistance in the Half-Metallic Double-Perovskite Ferrimagnet Mn2 FeReO6. Angew Chem Int Ed Engl. 2015;.
The first transition-metal-only double perovskite compound, Mn(2+) 2 Fe(3+) Re(5+) O6 , with 17 unpaired d electrons displays ferrimagnetic ordering up to 520 K and a giant positive magnetoresistance of up to 220?% at 5 K and 8 T. These properties result from the ferrimagnetically coupled Fe and Re sublattice and are affected by a two-to-one magnetic-structure transition of the Mn sublattice when a magnetic field is applied. Theoretical calculations indicate that the half-metallic state can be mainly attributed to the spin polarization of the Fe and Re sites.