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TT: Fachverband Tiefe Temperaturen

TT 83: SrTiO₃: A Versatile Material from Bulk Quantum Paraelectric to 2D Superconductor III (joint session TT/KFM/MA/O)

TT 83.6: Vortrag

Freitag, 22. März 2024, 10:45–11:00, H 0104

A multiferroic STO-based 2D-electron gas — •Marco Salluzzo¹, Yu Chen¹, Martando Rath¹, Daniela Stornaiuolo², Julien Brehin³, Manuel Bibes³, Julien Varignon⁴, and Cinthia Piamonteze⁵ — ¹Cnr-Spin Complesso Monte S. Angelo via Cinthia 80126, Napoli, Italy — ²Università "Federico II" di Napoli, Dipartimento di Fisica "Ettore Pancini", Complesso Monte S. Angelo via Cinthia 80126, Napoli, Italy — ³Unité Mixte de Physique, CNRS, Thales, Université Paris Saclay, Palaiseau, France — ⁴Crismat, CNRS , Ensicaen, Normandie Université, Caen, France — ⁵Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland.

The fabrication of artificial materials combining different functional properties is a powerful method to create novel quantum states. Here we demonstrate the realization of a 2D electron gas exhibiting a coexistence of ferroelectric and ferromagnetic order parameters, by heteroepitaxy.

The novel 2DEG is realized by inserting few unit cells of the antiferromagnetic insulator EuTiO₃ between a LaAlO₃ band insulating thin film (10 unit cells) and a Ca-doped SrTiO₃ single crystal.

By using Ti-L_2,3 and Eu M_4,5 edges x-ray linear dichroism and x-ray magnetic circular dichroism, we provide evidences of a switchable polarization, non-volatile tuning of Ti3d orbital splitting, and of a modulation of Eu-4f magnetic moment of the 2DEG by the FE-polarization[1]. The result is of interest for quantum spin-orbitronic applications.

[1] J. Bréhin et al., Nat. Phys. 19 (2023) 823

Keywords: Oxide 2DEGs; Ferroelectricity; Magnetism; Multiferroics