DataVXACS Applied Electronic MaterialsPaper
journal article·2022-07-26Open access

Ferromagnetic Quasi-Two-Dimensional Electron Gas with Trigonal Crystal Field Splitting

Yu Chen, Maria D’Antuono, Nicholas B. Brookes, Gabriella M. De Luca, Roberto Di Capua, Emiliano Di Gennaro, Giacomo Ghiringhelli, Cinthia Piamonteze, Daniele Preziosi, Benoit Jouault, Mariona Cabero, José María González-Calbet, Carlos León, Jacobo Santamaria, Alessia Sambri, Daniela Stornaiuolo, Marco Salluzzo

ACS Applied Electronic Materials· Volume 4· Issue 7
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Source abstract

Abstract

Interfacial inversion symmetry breaking gives rise to electronic properties that differ substantially from those of the bulk constituent materials. Here, we report on the realization of an artificial ferromagnetic quasi-two-dimensional electron gas (q2DEG) at the (111) interfaces between LaAlO3, EuTiO3, and SrTiO3 characterized by a reconstruction of the bulk quasioctahedral crystal field into a trigonal one. The q2DEG is created through a transfer of electrons to the EuTiO3 layers at the interface with LaAlO3, extending into the first layers of SrTiO3, as shown by an electron-energy-loss spectroscopy map of the titanium valence with atomic column resolution. Interestingly, polarized X-ray absorption spectroscopy shows that the Eu-4f and the Ti-3d magnetic moments order ferromagnetically and exhibit the same magnetic field dependence at low temperature. In addition, the q2DEG presents a sizable in-plane orbital moment even at low magnetic field (0.1 T) possibly related to Ti-3d electrons occupying bands with the main a1g orbital character. The results show an intriguing interplay between ferromagnetism, spin–orbit coupling, and trigonal crystal field splitting in the (111) LaAlO3/EuTiO3/SrTiO3 q2DEG.
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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

CNR-SPIN, Complesso Monte Sant’Angelo via Cinthia, I-80126 Napoli, Italy

Dipartimento di Fisica “E. Pancini”, Università di Napoli “Federico II”, Complesso Monte Sant’Angelo via Cinthia, I-80126 Napoli, Italy

ESRF. The European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS 40220, F-38043 Grenoble, France

Dipartimento di Fisica Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy

CNR-SPIN, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy

Photon Science Division, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

Université de Strasbourg, CNRS, IPCMS UMR 7504, 67034 Strasbourg, France

Laboratoire Charles Coulomb, UMR 5221, CNRS, Université de Montpellier, F-34095 Montpellier, France

Centro Nacional de Microscopia Electronica, Universidad Complutense, 28040 Madrid, Spain

GFMC, Dept. Fisica de Materiales, Facultad de Fisica, Universidad Complutense, 28040 Madrid, Spain

Funding

Agence Nationale de la Recherche · Ministero dell?Istruzione, dell?Universit? e della Ricerca · H2020 Future and Emerging Technologies

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