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Interplay between spin-orbit coupling and ferromagnetism in magnetotransport properties of a spin-polarized oxide two-dimensional electron system

Authors: D. Stornaiuolo, B. Jouault, E. Di Gennaro, A. Sambri, M. D’Antuono, D. Massarotti, F. Miletto Granozio,
R. Di Capua, G. M. De Luca, G. P. Pepe, F. Tafuri, and M. Salluzzo

Physical Review B 98, 075409 (2018)


We report on the magnetotransport properties of a spin-polarized two-dimensional electron system (2DES) formed in LaAlO3 (LAO)/EuTiO3/SrTiO3 (STO) heterostructures. We show that, at low temperature, the 2DES magnetoconductance exhibits weak antilocalization corrections related to Rashba spin-orbit scattering, in analogy with the LAO/STO 2DES. However, the characteristic spin-orbit scattering field decreases substantially for carrier density higher than 1.9×1013 cm−2. We attribute this behavior to the masking effect of ferromagnetism, which sets in at the same carrier density and at a temperature below 10 K. Our work shows that, while weak antilocalization corrections to the magnetoconductance are strongly reduced by the emergence of ferromagnetism, they persist in a large part of the phase diagram of a spin-polarized oxide 2DES.

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