Auteur(s): Di Capua R., Verma M., Radovic M., Strocov V., Piamonteze C., Guedes E., Plumb N., Chen Yu, D’antuono M., de Luca G., Di Gennaro E., Stornaiuolo D., Preziosi D., Jouault B., Miletto Granozio F., Sambri A., Pentcheva R., Ghiringhelli G., Salluzzo M.
(Article) Publié:
Npj Quantum Materials, vol. 7 p.41 (2022)
Texte intégral en Openaccess : 
Ref HAL: hal-03884373_v2
Ref Arxiv: 2109.06138
DOI: 10.1038/s41535-022-00448-4
Ref. & Cit.: NASA ADS
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Résumé:
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.