2024/02/21 by Itai Silber, Amram Azulay, Silber, I. +15
Materials Science · #Electronic and Structural Properties of Oxides #FOS: Physical sciences #Ferroelectric and Piezoelectric Materials #Machine Learning in Materials Science #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2402.14051
openalex publication_date 2024/02/21 · openalex created_date 2024/02/24 · openalex updated_date 2026/07/28
Oxide interfaces feature unique two-dimensional (2D) electronic systems with diverse electronic properties such as tunable spin-orbit interaction and superconductivity. Conductivity emerges in these interfaces when the thickness of an epitaxial polar layer surpasses a critical value, leading to charge transfer to the interface. Here, we show that depositing amorphous alumina on top of the polar oxide can reduce the critical thickness and enhance the superconducting properties for the (111) and the (100) SrTiO3-based interfaces. A detailed transmission electron microscopy analysis reveals that the enhancement of the superconducting properties is linked to the expansion of the LaAlO3 lattice in a direction perpendicular to the interface. We propose that the increase in the superconducting critical temperature, Tc, is a result of epitaxial strain