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Type: 
Journal
Description: 
Defects in an ultrathin Au/La2/3Sr1/3MnO3/SrTiO3 (Au/LSMO/STO) heterostructure displaying electroresistive behavior were studied using variable energy positron annihilation spectroscopy. Vacancy-like defects were found to be the dominant positron traps in the LSMO and STO thin perovskite oxides with a number density >1017 cm−3 and 2 × 1017 cm−3 in the STO substrate. High defect density was revealed by strong positron trapping at the Au/LSMO interface. Oxygen deficiency in LSMO would be the main source of these traps. Besides, a low density of sub-nano voids of ∼6 Å was found in the substrate and in the thin LSMO/STO films.
Publisher: 
AIP
Publication date: 
1 Sep 2011
Authors: 

R Ferragut, A Dupaquier, Stefano Brivio, Riccardo Bertacco, W Egger

Biblio References: 
Volume: 110 Issue: 5 Pages: 053511
Origin: 
Journal of Applied Physics