Abstract
Cation displacements, oxygen octahedral tilts, and magnetism of epitaxial, ferrimagnetic, insulating GdTiO${}_{3}$ films sandwiched between cubic SrTiO${}_{3}$ layers are studied using scanning transmission electron microscopy and magnetization measurements. With decreasing GdTiO${}_{3}$ film thickness, structural (GdFeO${}_{3}$-type) distortions are reduced, concomitant with a reduction in the Curie temperature. Ferromagnetism persists to smaller deviations from the cubic perovskite structure than is the case for the bulk rare-earth titanates. The results indicate that the ferromagnetic ground state is controlled by the narrow bandwidth, exchange and orbital ordering, and only to second order depends on the amount of the GdFeO${}_{3}$-type distortion.
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