AVS 52nd International Symposium
    Surface Science Tuesday Sessions
       Session SS2-TuM

Paper SS2-TuM1
Structure and Properties of SrTiO@sub 3@ (100) Surface

Tuesday, November 1, 2005, 8:20 am, Room 203

Session: Defects on Oxide Surfaces
Presenter: M. Nikiforov, University of Pennsylvania
Authors: R. Shao, University of Pennsylvania
M. Nikiforov, University of Pennsylvania
D. Bonnell, University of Pennsylvania
Correspondent: Click to Email
The surfaces of Strontium Titanate, one of the simplest perovskites, have been intensively studied because of its relevance to catalysis, environmental interactions and electronic devices. The (100) surface can terminate in either Sr-O or Ti-O planes. A number of reconstructions have been found on this surface depending on processing conditions. We have been able to stabilize atomically smooth (100) surfaces with unit cell (0.4 nm) and half unit cell (0.2 nm) steps assuring the presence of both types of terminations. Scanning tunneling spectroscopy of the two termination planes exhibits differences in electronic structure that are related to the proximity of Ti d orbitals near the surface. An orientational relationship between reconstructions and step edge direction is quantitatively related to strain from a systematic series of surfaces with different miscut angles. Finally the surface relaxation and electronic structure at low temperatures will be presented.