Condensed Matter Physics Seminar

Thursday, November 9, 2000, 2 p.m.
Plant Sciences Building, Room 1130

The physics of ordered double perovskites

Amitava Chattopadhyay

(Department of Physics, University of Maryland)

Abstract: The ordered double perovskite compounds such as Sr₂FeReO₆and Sr₂FeMoO₆ have attracted attention for their possible uses as spin valves and sources of spin polarized electrons. The magnetic transition temperature is substantially higher than the CMR manganites, for reasons that are not well understood. From the existing band-theory calculations, we derive the appropriate many-body physics and solve the theory to estimate the magnetic transition temperature T_c. We find that T_c is determined by a subtle interplay between carrier density and the Fe-Mo/Re site energy difference. Our results suggest that presently existing materials do not optimize T_c.

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