Bonmassar, Nicolas (2024)
Design and Atomic Scale Characterization
of Complex Oxide Interfaces.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00027455
Dissertation, Erstveröffentlichung, Verlagsversion
Kurzbeschreibung (Abstract)
The framework of my thesis includes four main categories: i) An introduction about the physics, materials, and methods used in this work. ii) The characterization of interfacial physical properties resulting in the deduction of structure-property relationships at the atomic scale. iii) The control of interface sharpness at the atomic scale, which is crucial for the realization of complex oxide technologies in spintronics and electronics. iv) The development and design of new types of interfaces with completely new functionalities. More specifically, the overarching objective of this thesis was to design certain types of interfaces and employ advanced scanning transmission electron microscopy characterization techniques on oxide superlattices. In the first part, the focus lies on Sr-La intermixing-induced superconductivity and probing the evolution of the electronic states from an antiferromagnetic insulator to a superconductor and a metal at the atomic scale. The outcome of the first part includes a novel way to differentiate distinct quantum states, such as insulating materials, metallic-, and superconducting materials, at the subnanometer scale based on the combined detection and interpretation of hole doping, Sr-content, and oxygen vacancies. In the following part, I aimed to enhance the interface sharpness by strategically utilizing materials that exhibit both structural and chemical coherence. The primary aim was to minimize the chemical potential gradient at the interface to achieve unprecedented control over oxide interfaces at the atomic level. The third part of this thesis is about a novel interface paradigm, denoted as the step edge interface, which enables the simultaneous growth of thin films in two distinct directions, denoted as the bi-directional growth of thin films. In the last part of my thesis, I address a key limitation of this innovative approach; while it offers an additional dimension of control, it necessitates careful consideration of the a-, b-, and c-axes of the substrate and the materials of choice. Particularly, while one of these crystallographic parameters may align suitably, the other parameters assume critical significance when growing thin films on offcut substrates, thereby enabling the formation of planar defects such as antiphase boundaries. Hence, while the newly developed bi-directional growth utilizing offcut substrates opens up an additional degree of freedom for the design of exotic quantum phenomena, I show what problems are there to overcome and how to solve these problems for the future integration of this novel technique into electronics and spintronics.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2024 | ||||
Autor(en): | Bonmassar, Nicolas | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Design and Atomic Scale Characterization of Complex Oxide Interfaces | ||||
Sprache: | Englisch | ||||
Referenten: | Kübel, Prof. Dr. Christian ; Aken, Prof. Dr. Peter A. van | ||||
Publikationsjahr: | 20 Juni 2024 | ||||
Ort: | Darmstadt | ||||
Kollation: | 99 Seiten | ||||
Datum der mündlichen Prüfung: | 28 Mai 2024 | ||||
DOI: | 10.26083/tuprints-00027455 | ||||
URL / URN: | https://tuprints.ulb.tu-darmstadt.de/27455 | ||||
Kurzbeschreibung (Abstract): | The framework of my thesis includes four main categories: i) An introduction about the physics, materials, and methods used in this work. ii) The characterization of interfacial physical properties resulting in the deduction of structure-property relationships at the atomic scale. iii) The control of interface sharpness at the atomic scale, which is crucial for the realization of complex oxide technologies in spintronics and electronics. iv) The development and design of new types of interfaces with completely new functionalities. More specifically, the overarching objective of this thesis was to design certain types of interfaces and employ advanced scanning transmission electron microscopy characterization techniques on oxide superlattices. In the first part, the focus lies on Sr-La intermixing-induced superconductivity and probing the evolution of the electronic states from an antiferromagnetic insulator to a superconductor and a metal at the atomic scale. The outcome of the first part includes a novel way to differentiate distinct quantum states, such as insulating materials, metallic-, and superconducting materials, at the subnanometer scale based on the combined detection and interpretation of hole doping, Sr-content, and oxygen vacancies. In the following part, I aimed to enhance the interface sharpness by strategically utilizing materials that exhibit both structural and chemical coherence. The primary aim was to minimize the chemical potential gradient at the interface to achieve unprecedented control over oxide interfaces at the atomic level. The third part of this thesis is about a novel interface paradigm, denoted as the step edge interface, which enables the simultaneous growth of thin films in two distinct directions, denoted as the bi-directional growth of thin films. In the last part of my thesis, I address a key limitation of this innovative approach; while it offers an additional dimension of control, it necessitates careful consideration of the a-, b-, and c-axes of the substrate and the materials of choice. Particularly, while one of these crystallographic parameters may align suitably, the other parameters assume critical significance when growing thin films on offcut substrates, thereby enabling the formation of planar defects such as antiphase boundaries. Hence, while the newly developed bi-directional growth utilizing offcut substrates opens up an additional degree of freedom for the design of exotic quantum phenomena, I show what problems are there to overcome and how to solve these problems for the future integration of this novel technique into electronics and spintronics. |
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Alternatives oder übersetztes Abstract: |
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Status: | Verlagsversion | ||||
URN: | urn:nbn:de:tuda-tuprints-274559 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften 500 Naturwissenschaften und Mathematik > 530 Physik 500 Naturwissenschaften und Mathematik > 540 Chemie |
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Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft |
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Hinterlegungsdatum: | 20 Jun 2024 12:21 | ||||
Letzte Änderung: | 21 Jun 2024 07:52 | ||||
PPN: | |||||
Referenten: | Kübel, Prof. Dr. Christian ; Aken, Prof. Dr. Peter A. van | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 28 Mai 2024 | ||||
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