paper

Octahedral tilt independent magnetism in confined GdTiO $_{3}$ films

arXiv:1711.05808 · doi:10.1063/1.5016174

Abstract

Polarized neutron reflectometry measurements are presented exploring the evolution of ferrimagnetism in GdTiO $_{3}$ films as they are confined between SrTiO $_{3}$ layers of variable thicknesses. As GdTiO $_{3}$ films approach the thin layer limit and are confined within a substantially thicker SrTiO $_{3}$ matrix, the TiO $_{6}$ octahedral tilts endemic to GdTiO $_{3}$ coherently relax toward the undistorted, cubic phase of SrTiO $_{3}$ . Our measurements reveal that the ferrimagnetic state within the GdTiO $_{3}$ layers survives as the TiO $_{6}$ octahedral tilts in the GdTiO $_{3}$ layers are suppressed. Furthermore, our data suggest that a magnetic dead layer develops within the GdTiO $_{3}$ layer at each GdTiO $_{3}$ / SrTiO $_{3}$ interface. The ferrimagnetic moment inherent to the core GdTiO $_{3}$ layers is negligibly (in models with dead layers) or only weakly (in models without dead layers) impacted as the octahedral tilt angles are suppressed by more than 50 $%$ and the $t_{2 g}$ bandwidth is dramatically renormalized.

5 pages, 4 figures

Octahedral tilt independent magnetism in confined GdTiO3​ films

Abstract

Octahedral tilt independent magnetism in confined GdTiO $_{3}$ films