Leiden University Scholarly Publications

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Lebedev, N. (2020)

Growth and Transport Properties of [Rare Earth]TiO3/SrTiO3 Interfaces

Doctoral Thesis
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...Show moreThis 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.Show less
Oxide interfaces
Anomalous Hall Effect
Rare Earth titanates
Disordered Superconductors
Resistance minimum
Hysteretic Magnetoresistance
Linear Magnetoresistance
All authors
Lebedev, N.
Supervisor
Aarts, J.
Committee
Caviglia, A; Zeitler, U.; Eliel, E.R.; Molen, S.J. van der
Qualification
Doctor (dr.)
Awarding Institution
Leiden Institute of Physics (LION), Faculty of Science, Leiden University
Date
2020-12-01
Title of host publication
Casimir PhD Series
ISBN (print)
9789085934547

Publication Series

Name
2020-28

Funding

Sponsorship
This work is part of the DESCO research programme of the Foundation for Fundamental Research on Matter (FOM), which is part of the Dutch Research Council (NWO).