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 LaAlO3, EuTiO3 and SrTiO3 band insulators. By using density functional theory calculations, transport, magnetic and x-ray spectroscopy measurements, we find that the filling of titanium-bands with 3dxz/3dyz orbital character in the EuTiO3 layer and at the interface with SrTiO3 induces an antiferromagnetic to ferromagnetic switching of the exchange interaction between Eu-4f7 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.
Orbital selective switching of ferromagnetism in an oxide quasi two-dimensional electron gas / Di Capua, R.; Verma, M.; Radovic, M.; Strocov, V. N.; Piamonteze, C.; Guedes, E. B.; Plumb, N. C.; Chen, Y.; D'Antuono, M.; De Luca, G. M.; Di Gennaro, E.; Stornaiuolo, D.; Preziosi, D.; Jouault, B.; Miletto Granozio, F.; Sambri, A.; Pentcheva, R.; Ghiringhelli, G.; Salluzzo, M.. - In: NPJ QUANTUM MATERIALS. - ISSN 2397-4648. - 7:1(2022), pp. 41_1-41_10. [10.1038/s41535-022-00448-4]
Orbital selective switching of ferromagnetism in an oxide quasi two-dimensional electron gas
Di Capua R.;D'Antuono M.;De Luca G. M.;Di Gennaro E.;Stornaiuolo D.;Miletto Granozio F.;Salluzzo M.
2022
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 LaAlO3, EuTiO3 and SrTiO3 band insulators. By using density functional theory calculations, transport, magnetic and x-ray spectroscopy measurements, we find that the filling of titanium-bands with 3dxz/3dyz orbital character in the EuTiO3 layer and at the interface with SrTiO3 induces an antiferromagnetic to ferromagnetic switching of the exchange interaction between Eu-4f7 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
