半金属双钙钛矿亚铁磁体 Mn2FeReO6 中的巨磁电阻。
Giant magnetoresistance in the half-metallic double-perovskite ferrimagnet Mn2FeReO6.
机构信息
Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854 (USA).
Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen (Denmark).
出版信息
Angew Chem Int Ed Engl. 2015 Oct 5;54(41):12069-73. doi: 10.1002/anie.201506456. Epub 2015 Jul 31.
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.
首例仅含过渡金属的双钙钛矿化合物 Mn(2+) 2 Fe(3+) Re(5+) O6 拥有 17 个未配对的 d 电子，在 520 K 时表现出亚铁磁有序，在 5 K 和 8 T 时具有高达 220%的巨大正磁电阻。这些特性源于亚铁磁耦合的 Fe 和 Re 亚晶格，并且在施加磁场时，Mn 亚晶格的磁结构发生二到一的转变，从而对其产生影响。理论计算表明，该材料的半金属态主要归因于 Fe 和 Re 位点的自旋极化。
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