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TT: Fachverband Tiefe Temperaturen
TT 58: SrTiO3: A Versatile Material from Bulk Quantum Paraelectric to 2D Superconductor: Poster (joint session TT/KFM/MA/O)
TT 58.4: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster E
ferromagnetic two-dimensional electron gas in oxide interfaces — •Yu Chen1, Maria D’Antuono1,2, Martando Rath1, Cinthia Piamonteze3, Daniele Preziosi4, Benoit Jouault5, Daniela Stornaiuolo1,2, and Marco Salluzzo1 — 1CNR-SPIN, Napoli, Italy — 2Università di Napoli ”Federico II”, Italy — 3Photon Science Division, Paul Scherrer Institut, Switzerland — 4Université de Strasbourg, CNRS, IPCMS UMR, France — 5Laboratoire Charles Coulomb, UMR 5221, CNRS, Université de Montpellier, France
Interfacial inversion symmetry breaking triggers novel phenomena not observed in bulk materials, such as unconventional superconductivity and magnetism. Here, we report on the realization of ferromagnetic two-dimensional electron gas (2DEG) at (001) and (111) interfaces between LaAlO3, EuTiO3, and SrTiO3. At variance with the octahedral and quasi-octahedral symmetry in bulk SrTiO3 and (001) interface, trigonal crystal field is reconstructed at (111) interface. The experiments of transport, magnetic and x-ray spectroscopy indicate that the filling of Ti 3d bands in the EuTiO3 layer and at the interface with SrTiO3 induces an exchange interaction between Eu-4f7 magnetic moments. We observe carrier density-dependent ferromagnetic correlations and anomalous Hall effect, sizable in-plane orbital moment possibly related to Ti-3d electrons occupying bands with the main 3dxz,zy and a1g orbital characters at (001) and (111) interfaces, respectively. Our findings show intriguing interplay between ferromagnetism, spin-orbit coupling, and symmetry breaking at oxide 2DEG, serving as a guide for the materials design of advanced spintronics.
Keywords: spin-polarized 2DEG; trigonal crystal field; multi-orbital; x-ray spectroscopy; oxide interfaces