The surface structure of SrTiO3 at high temperatures under influence of oxygen | Zendy

M. B. S. Hesselberth | Zendy; Sense Jan van der Molen | Zendy; J. Aarts | Zendy

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The surface structure of SrTiO3 at high temperatures under influence of oxygen

Author(s) -

M. B. S. Hesselberth,

Sense Jan van der Molen,

J. Aarts

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4864186

Subject(s) - oxygen , materials science , atmospheric temperature range , transition temperature , surface energy , range (aeronautics) , chemistry , analytical chemistry (journal) , chemical physics , condensed matter physics , thermodynamics , composite material , physics , superconductivity , organic chemistry , chromatography

We use low energy electron microscopy to investigate the structure of the SrTiO3 (001) surface at elevated temperatures and different oxygen pressures. Upon varying the temperature between 500 °C and 900 °C in oxygen pressures ranging from 10−9 millibar to 10−4 millibar, two surface transitions are found to be present. The lower temperature (1 × 1) → (2 × 1) transition that is known to occur in ultrahigh vacuum can be reversed by increasing the oxygen pressure. At higher temperatures, we observe a (2 × 1) → disordered (1 × 1) transition which is irreversible in the experimental parameter range. The observations are expected to have a strong bearing on the growth of interface structures.

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