Strong ferromagnetism and weak antiferromagnetism in double perovskites : Sr 2 Fe M O 6 ( M = Mo , W , and Re )
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چکیده
Double perovskites Sr 2 FeM O 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 Néel temperature of only 16∼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.
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تاریخ انتشار 2001