High Mobility and Directional Magnetotransport in (001) and (110) oriented 2DEG at Spin-Coated PrAlO3/SrTiO3 Interfaces

We report 2DEG formation at PrAlO₃/SrTiO₃ interfaces in both (001) and (110) orientations using spin coating. These 2DEGs exhibit high conductivity, with Hall mobilities of 150 cm²/V·s and 826 cm²/V·s for (001) and (110) orientations at 2 K, respectively. The Kondo effect is observed in both samples. Out-of-plane magnetoresistance (MR) confirms electron-electron interaction in high magnetic fields, while in-plane MR shows a transition from weak localization to weak anti-localization. Additionally, we report strong anisotropy in the spin-coated (110)-2DEG along the [001] and [1-10] crystallographic directions. The Rashba spin splitting energy (Δ) shows a maximum difference of Δ_{[001] − Δ[1-10]} ∼ 0.71 meV at 2 K. Spin relaxation follows the D’yakonov-Perel mechanism. This work highlights the potential of spin coating for producing high-quality oxide 2DEGs. We gratefully acknowledge financial support from IIT Kanpur and the Department of Science and Technology, India (DST/NM/TUE/QM-06/2019).