Interface-driven ferromagnetism within the quantum wells of a rare earth titanate superlattice

Abstract

Here we present polarized neutron reflectometry measurements exploring thin film heterostructures comprised of a strongly correlated Mott state, GdTiO${}_3$, embedded with SrTiO${}_3$ quantum wells. Our results reveal that the net ferromagnetism inherent to the Mott GdTiO${}_3$ matrix propagates into the nominally nonmagnetic SrTiO${}_3$ quantum wells and tracks the magnetic order parameter of the host Mott insulating matrix. Beyond a well thickness of 5 SrO layers, the magnetic moment within the wells is dramatically suppressed, suggesting that quenched well magnetism comprises the likely origin of quantum critical magnetotransport in this thin film architecture. Our data demonstrate that the interplay between proximate exchange fields and polarity induced carrier densities can stabilize extended magnetic states within SrTiO${}_3$ quantum wells.

arXiv comment5 pages, 4 figures

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• Interface-induced magnetism in perovskite quantum wells
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• Correlation between metal-insulator transitions and structural distortions in high-electron-density SrTiO3 quantum wells
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Cited by in corpus (5)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Ferromagnetism and spin-dependent transport at a complex oxide interface
• Disorder versus two transport lifetimes in a strongly correlated electron liquid
• Resolving interfacial charge transfer in titanate superlattices using resonant X-ray reflectometry
• Octahedral tilt independent magnetism in confined GdTiO${}_3$ films