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

Jose Mardegan1*, Dennis Christensen2*, Yunzhong Chen2, Sergii Parchenko1, Sridhar Avula1, Nazaret Ortiz-Hernandez1, Martin Decker1, Cinthia Piamonteze1, Nini Pryds2, Urs Staub1*

1 Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

2 Department of Energy Conversion and Storage, Technical University of Denmark, Risø campus, 4000 Roskilde, Denmark

* Corresponding authors emails: jrlmardegan@gmail.com, dechr@dtu.dk, urs.staub@psi.ch
DOI10.24435/materialscloud:xx-et [version v1]

Publication date: Sep 13, 2021

How to cite this record

Jose Mardegan, Dennis Christensen, Yunzhong Chen, Sergii Parchenko, Sridhar Avula, Nazaret Ortiz-Hernandez, Martin Decker, Cinthia Piamonteze, Nini Pryds, Urs Staub, Magnetic and electronic properties at the γ-Al2O3/SrTiO3 interface, Materials Cloud Archive 2021.147 (2021), doi: 10.24435/materialscloud:xx-et.


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 Delta0 ∼ 1.9 eV splitting between the t2g and eg states for the Ti4+ 3d0 orbitals. In addition these results indicate that the lowest energy states have the out-of-plane dxz/dyz symmetry. The isotropic magnetic moment behavior and the lowest energy dxz/dyz states 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 dxy ground state.

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two-dimensional electron gas magnetism x-ray absorption spectroscopy Experimental

Version history:

2021.147 (version v1) [This version] Sep 13, 2021 DOI10.24435/materialscloud:xx-et