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 >10^17 cm-3 and 2x10^17 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 about 6 A° was found in the substrate and in the thin LSMO/STO films.
Study of defects in an electroresistive Au/La0.67Sr0.33MnO3/SrTiO3(001) heterostructure by positron annihilation
FERRAGUT, RAFAEL OMAR;DUPASQUIER, ALFREDO;BRIVIO, STEFANO;BERTACCO, RICCARDO;
2011-01-01
Abstract
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 >10^17 cm-3 and 2x10^17 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 about 6 A° was found in the substrate and in the thin LSMO/STO films.| File | Dimensione | Formato | |
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