MAGNETORESISTANCE IN DOUBLE-PEROVSKITE STRUCTURE FOR Sr₂FeMoO₆

Abstract

We investigate the magnetoresistance in double-perovskite Sr 2 FeMoO 6 . In Fe -planes, ferromagnetic phases are obtained via a Kondo lattice model different from conventional ones. In Fe -planes, ferromagnetic states arise by electron–electron interactions mediated by phonon-enhanced spin flips different from bare Kondo spin flips. The appreciable magnetoresistance is mainly contributed by electrons in Fe -planes. The ferrimagnetism observed in the material Sr 2 FeMoO 6 is explained through the antiparallel alignment between the ferromagnetic spin alignments in Fe -planes and those in Mo -planes which are also driven by our theory, and the difference in magnitude of spin in Mo -planes and Fe -planes.