Magnetic and electronic properties at the γ-Al2O3/SrTiO3 interface

J. R. L. Mardegan, D. V. Christensen*, Y. Z. Chen, S. Parchenko, S. R. Avula, N. Ortiz-Hernandez, M. Decker, C. Piamonteze, N. Pryds, U. Staub

*Corresponding author for this work

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The magnetic and electronic nature of the γ-Al2O3/SrTiO3 spinel/perovskite interface is explored by means of x-ray absorption spectroscopy. Polarized x-ray techniques combined with atomic multiplet calculations reveal localized magnetic moments assigned to Ti3+ at the interface with equivalent size for in- and out-of-plane magnetic field directions. Although magnetic fingerprints are revealed, the Ti3+ magnetism can be explained by a paramagnetic response at low temperature under applied magnetic fields. Modeling the x-ray linear dichroism results in a Δ0 ∼ to 1.9 eV splitting between the t(2g) and e(g) states for the Ti4+ 3d(0) orbitals. In addition these results indicate that the lowest energy states have the out-of-plane d(xz)/d(yz) symmetry. The isotropic magnetic moment behavior and the lowest energy states d(xz)/d(yz) are in contrast to the observations for the two-dimensional electron gas at the perovskite/perovskite interface of LaAlO3/SrTiO3 that exhibits an anisotropic magnetic d(xy) ground state.
Original languageEnglish
Article number134423
JournalPhysical Review B
Issue number13
Number of pages7
Publication statusPublished - 2019

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