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Journal Articles Npj Quantum Materials Year : 2022

Orbital selective switching of ferromagnetism in an oxide quasi two-dimensional electron gas

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M. Radovic
V. Strocov
N. Plumb
R. Pentcheva

Abstract

Abstract Multi-orbital physics in quasi-two-dimensional electron gases (q2DEGs) triggers intriguing phenomena not observed in bulk materials, such as unconventional superconductivity and magnetism. Here, we investigate the mechanism of orbital selective switching of the spin-polarization in the oxide q2DEG formed at the (001) interface between the LaAlO 3 , EuTiO 3 and SrTiO 3 band insulators. By using density functional theory calculations, transport, magnetic and x-ray spectroscopy measurements, we find that the filling of titanium-bands with 3d xz /3d yz orbital character in the EuTiO 3 layer and at the interface with SrTiO 3 induces an antiferromagnetic to ferromagnetic switching of the exchange interaction between Eu-4f 7 magnetic moments. The results explain the observation of the carrier density-dependent ferromagnetic correlations and anomalous Hall effect in this q2DEG, and demonstrate how combined theoretical and experimental approaches can lead to a deeper understanding of emerging electronic phases and serve as a guide for the materials design of advanced electronic applications.
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Dates and versions

hal-03884373 , version 1 (23-11-2021)
hal-03884373 , version 2 (07-12-2022)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

R. Di Capua, M. Verma, M. Radovic, V. Strocov, C. Piamonteze, et al.. Orbital selective switching of ferromagnetism in an oxide quasi two-dimensional electron gas. Npj Quantum Materials, 2022, 7 (1), pp.41. ⟨10.1038/s41535-022-00448-4⟩. ⟨hal-03884373v2⟩
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