In situ study of emerging metallicity on ion-bombarded SrTiO3 surface
Abstract
We report how argon bombardment induces metallic states on the surface of insulating SrTiO3 at different temperatures by combining in situ conductance measurements and model calculations. At cryogenic temperatures, ionic bombardment created a thin–but much thicker than the argon-penetration depth–steady-state oxygen-vacant layer, leading to a highly-concentric metallic state. Near room temperatures, however, significant thermal diffusion occurred and the metallic state continuously diffused into the bulk, leaving only low concentration of electron carriers on the surface. Analysis of the discrepancy between the experiments and the models also provided evidence for vacancy clustering, which seems to occur during any vacancy formation process and affects the observed conductance.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 01, 2011
- Source ID
- 10.1063/1.3650254
Entities
People
- Heiko Gross
- Namrata Bansal
- Seongshik Oh
- Yong-seung Kim
Organizations
- National Science Foundation
- Office of Naval Research
- Rutgers University