Domains and anisotropy in SrTiO3
Abstract/Contents
- Abstract
- SrTiO3 has been a material of great interest to the scientific community for decades, but despite the long standing interest in it, there have been a number of aspects around its low temperature properties which have been taken for granted. The received wisdom in the community has been largely that the tetragonal phase of SrTiO3 is irrelevant to the low temperature physics. The smallness of the tetragonality in SrTiO3 makes this quite a compelling argument at first glance, but closer examinations have shown that this smallness in structural tetragonality does not always lead to a smallness in other anisotropic quan- tities. Measurements of the anisotropic dielectric constant from the 1970s by Sakudo and Unoki[105] showed anisotropies of approximately two at low temperatures. More recently, spatially resolved scanning quantum interference device measurements of electrical properties have shown anisotropies of tens of percent which are strongly suggestive of domains in SrTiO3 systems[89, 52]. These more recent measurements have made it clear that a careful reexamination of the assumption that the tetragonality of SrTiO3 is largely irrelevant is in order. This thesis attempts to make a careful examination of the question of the influence of SrTiO3's tetragonality on the electric properties of not only bulk SrTiO3, but also SrTiO3 heterostructures. While the study of the intrinsic properties of SrTiO3 is a niche topic, the results of this thesis extend beyond just the bulk SrTiO3 community. Since SrTiO3 is used widely as a substrate for oxide heterostructures, whose low temperature properties are then examined, the results of this thesis will be of interest to anyone working with systems involving SrTiO3 at low temperature, and in particular electrical properties. Specifically the fields of mono-layer iron selenide on SrTiO3 and cuprate superconductor thin films should consider carefully the effects of the tetragonality of SrTiO3 and potentially its domain structure. The methods which are used in this thesis for controlling the domain structure of SrTiO3 are applicable to other material systems which undergo structural phase transitions and may eventually form the basis for more low temperature experiments involving SrTiO3, where particular knowledge of the domain structure is vital.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2018; ©2018 |
| Publication date | 2018; 2018 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Merz, Tyler Aaron |
|---|---|
| Degree supervisor | Hwang, Harold Yoonsung, 1970- |
| Thesis advisor | Hwang, Harold Yoonsung, 1970- |
| Thesis advisor | Fisher, Ian R. (Ian Randal) |
| Thesis advisor | Raghu, Srinivas, 1978- |
| Degree committee member | Fisher, Ian R. (Ian Randal) |
| Degree committee member | Raghu, Srinivas, 1978- |
| Associated with | Stanford University, Department of Applied Physics. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Tyler Aaron Merz. |
|---|---|
| Note | Submitted to the Department of Applied Physics. |
| Thesis | Thesis Ph.D. Stanford University 2018. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2018 by Tyler Aaron Merz
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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