Alexandria Digital Research Library

Emergent states and magnetism in perovskite titanate heterostructures

Author:
Jackson, Clayton Adam Chase
Degree Grantor:
University of California, Santa Barbara. Materials
Degree Supervisor:
Susanne Stemmer
Place of Publication:
[Santa Barbara, Calif.]
Publisher:
University of California, Santa Barbara
Creation Date:
2014
Issued Date:
2014
Topics:
Physics, Condensed Matter and Mathematics
Keywords:
Molecular beam epitaxy
Solid state physics
Magnetism
Oxides
Genres:
Dissertations, Academic and Online resources
Dissertation:
Ph.D.--University of California, Santa Barbara, 2014
Description:

Complex oxides show a wide array of phenomena, including magnetic states, ferroelectricity, and superconductivity. Furthermore, the advent of atomic scale engineering of the oxides using molecular beam epitaxy (MBE) has facilitated the discovery of novel phenomena in thin films and heterostructures not seen in bulk. Complex oxide perovskite titanate heterostructures composed of both Mott and band insulators can be fabricated readily and exhibit unique properties, including interfacial two-dimensional electron gases (2DEGs), superconductivity, and magnetic ordering.

The objective of this Dissertation is to study the relationships between emergent phenomena and heterostructure design using advanced MBE growth techniques and characterization tools, with the intent of developing controllable states of matter. The impact of strain and octahedral connectivity in epitaxially mismatched heterostructures on magnetism and electrical transport is addressed, as well as proximity effects and the influence of magnetically ordered layers on neighboring low-dimensional itinerant systems.

The Dissertation begins with a motivational overview of materials and associated phenomena, describing the unique emergent properties associated with thin films. This is followed by a description of the organization of the remainder of the text. The methods implemented, including MBE and electrical transport characterization, are then discussed. Structure-magnetism and structure-transport correlations are demonstrated, as well as tunable emergent ferromagnetism in GdTiO3/SrTiO3 heterostructures and quantum critical behavior in SmTiO3/SrTiO3 heterostructures. Recent progress on devices based on GdTiO3/SrTiO3 are discussed. The dissertation closes with a brief summary and discussion of future works.

Physical Description:
1 online resource (139 pages)
Format:
Text
Collection(s):
UCSB electronic theses and dissertations
ARK:
ark:/48907/f3jw8c1r
ISBN:
9781321349566
Catalog System Number:
990045117110203776
Rights:
Inc.icon only.dark In Copyright
Copyright Holder:
Clayton Jackson
File Description
Access: Public access
Jackson_ucsb_0035D_12288.pdf pdf (Portable Document Format)