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In-situ study of emerging metallicity and memory effect on ion-beam bombarded strontium titanate surface
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Gross, Heiko. In-situ study of emerging metallicity and memory effect on ion-beam bombarded strontium titanate surface. Retrieved from https://doi.org/doi:10.7282/T3CJ8DNJ

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TitleIn-situ study of emerging metallicity and memory effect on ion-beam bombarded strontium titanate surface
NameGross, Heiko (author); Oh, Seongshik (chair); Wu, Weida (co-chair); Cheong, Sang-Wook (co-chair); Rutgers University; Graduate School - New Brunswick
Date Created
Other Date2009-10 (degree)
SubjectPhysics and Astronomy, Strontium compounds--Surfaces
Extentxi, 91 p. : ill.
DescriptionIn this work we present an investigation of the occurrence of conductivity on the surface of SrTiO3 due to argon ion bombardment. We created a model to describe this process and found that the temperature during the ion milling is a crucial factor for the conductivity. Depending on the temperatures we found surface carrier densities ranging from 1.5*10^18 to 2.6*10^20cm^-3 by just analyzing the conductivity behavior.
Clustering of vacancies goes along with temperature and affects the conductivity significantly. Furthermore we found that ion milling is a gentle way create vacancies because the clustering rate is small compared to annealing samples in high vacuum. The amount of clusters at room temperature was measured to be around 3-4 times higher than at -140C.
We found that samples with a conducting surface change their resistance over time at room temperature due to the ongoing process of oxygen vacancy clustering. This effect may be suppressed by decreasing the temperature.
The bistable switching behavior in oxygen deficient SrTiO3 is shown without any additional doping. The vacancy migration is the major mechanism behind this memory effect. Comparing this behavior with annealed samples in high vacuum shows that the therein present amount of vacancy clusters must be much larger and has a negative effect on the bistable switching behavior.
NoteM.S.
NoteIncludes bibliographical references (p. 83-87)
Noteby Heiko Gross
Genretheses, ETD graduate
Persistent URLhttps://doi.org/doi:10.7282/T3CJ8DNJ
Languageeng
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work
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