Strong ferromangnetism and weak antiferroamgnetism in double perovskites: Sr${}_2$Fe{/it M}O${}_6$ ({/it M}=Mo, W and Re)

Abstract

Double perovskites Sr${}_2$FeMO${}_6$ (M=Mo and Re) exhibit significant colossal magnetoresistance even at room temperature due to the high Curie Temperature (419K and 401K). However, such a high Curie Temperature is puzzling, given the large separation between magnetic elements (Fe). Moreover, with M=W, the electronic and magnetic properties suddenly change to insulating and antiferromagnetic with the N{é}el temperature of only 16$\sim$37 K. Based on detailed electronic structure calculations, a new mechanism is proposed which stabilizes the strong ferromagnetic state for M=Mo and Re and is passivated for M=W.

4 pages, 3 figures; accepted by PRB as rapid communication

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