Emergent phenomena in Mott/band insulator heterostructures
- 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:
- 2013
- Issued Date:
- 2013
- Topics:
- Engineering, Materials Science
- Keywords:
- Molecular beam epitaxy,
Mott insualtor,
Two-dimenstional electron gas,
Rare earth titanate,
Perovskite oxide, and
Magnetism - Genres:
- Online resources and Dissertations, Academic
- Dissertation:
- Ph.D.--University of California, Santa Barbara, 2013
- Description:
The discovery of a two dimensional electron gas (2DEG) at the interface of two insulating oxides (such as LaAlO3/SrTiO 3) has attracted a significant amount of attention for novel oxide based electronics and fundamental physics studies. While most studies have been focused on LaAlO3/SrTiO3 heterostructures less attention has been given to other material systems. Here, we present recent results on a different material system, GdTiO3/SrTiO3. GdTiO 3 is a ferrimagnetic Mott insulator with a polar (001)c surface, while SrTiO3 is a band insulator with a non-polar (001) surface. In this study, GdTiO3 and SrTiO3 layers were grown by hybrid molecular beam epitaxy. Electrical measurements showed the formation of a two-dimensional electron gas (2DEG) at the GdTiO3/SrTiO 3 interface with total sheet carrier density of ~ 3x10 14 cm-2 per interface. The staggered band alignment between GdTiO3 and SrTiO3 causes the 2DEG to be located on the SrTiO3 side of the interface. Shubnikov-de Haas oscillations of the longitudinal resistance in a quantizing magnetic field were observed, indicating two-dimensionality of the electron gas. Ferromagnetic behavior was observed in both GdTiO3/SrTiO3 (where SrTiO 3 is doped by the interface) and La-doped SrTiO3 systems. We also discuss electron correlation effects in this system.
- Physical Description:
- 1 online resource (250 pages)
- Format:
- Text
- Collection(s):
- UCSB electronic theses and dissertations
- Other Versions:
- http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:3596210
- ARK:
- ark:/48907/f39p2zmw
- ISBN:
- 9781303426421
- Catalog System Number:
- 990040770730203776
- Copyright:
- Pouya Moetakef, 2013
- Rights:
- In Copyright
- Copyright Holder:
- Pouya Moetakef
Access: This item is restricted to on-campus access only. Please check our FAQs or contact UCSB Library staff if you need additional assistance. |