Journal
APPLIED PHYSICS LETTERS
Volume 92, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2913005
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The authors have reproducibly obtained an atomically well-defined SrTiO3 (111) surface by a combined chemical etching and thermal annealing process. Although thermodynamic mixed termination is preferred as a means of suppressing the surface dipole, the kinetics-driven etching process, via selective etching of SrO34-, enables a single-terminated surface to be obtained. Subsequent O-2 annealing of the etched surface produces a clear step-and-terrace structure. Atomically flat terraces and only one-unit-cell-high step edges are observed, signifying a single-terminated surface. This study might pave the way for constructing (111)-oriented perovskite oxide superlattices, which would be expected to demonstrate new and better physical phenomena and functionalities. (c) 2008 American Institute of Physics.
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