Proefschrift

Growth and Transport properties of (Rare Earth)TiO3 / SrTiO3 interfaces

This thesis presents the results of a study on the interfaces of insulating oxides with and without the insertion of a magnetic layer.

Auteur: Lebedev, N.
Datum: 01 december 2020
Links: Thesis in Leiden Repository

This thesis presents the results of a study on the interfaces of insulating oxides with and without the insertion of a magnetic layer. Such interfaces can host a two-dimensional electron liquid, making the interface conducting, with a wealth of phenomena to study. In order to create such interfaces, layers of oxides such as lanthanum aluminate, lanthanum titanate, and rare earth titanates were grown on the surface of crystalline strontium titanate. The growth method was pulsed laser deposition, in which short laser pulses ablate a target of the required material. The transport properties of these systems were studied by applying an external voltage to the back surface of the insulating substrate. Such a gate voltage allows us to vary the amount of charge carriers at the interface. In this way we could investigate magnetic effects occurring in the charge transport and their connection to the superconducting properties of oxide interfaces. The work resulted in a deeper of understanding of the so-called anomalous Hall effect, the magnetoresistance behavior, the origin of a resistance minimum in the back-gate experiments, and magnetoresistance hysteresis in the superconducting state in the various systems which were studied.