TITLE

Strain screening by mobile oxygen vacancies in SrTiO3

AUTHOR(S)
Yongsam Kim; Disa, Ankit S.; Babakol, Timur E.; Brock, Joel D.
PUB. DATE
June 2010
SOURCE
Applied Physics Letters;6/21/2010, Vol. 96 Issue 25, p251901
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Recently, Freedman et al. [Phys. Rev. B 80, 064108 (2009)] calculated the elastic dipole tensor for several types of point defects in SrTiO3 and showed that it is nearly traceless for oxygen vacancies. Thus, mobile oxygen vacancies are predicted to screen elastic strain fields. Here, we report detailed diffuse x-ray scattering measurements of bulk SrTiO3 crystals prepared with controlled oxygen vacancy distributions. We verify the traceless nature of the elastic dipole tensor of an oxygen vacancy and demonstrate both correlations between oxygen vacancies and elastic strain screening by oxygen vacancies.
ACCESSION #
51709536

 

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