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.
2011
File in questo prodotto:
File Dimensione Formato  
Ferragut_etal_JApplPhys_110_053511.pdf

Accesso riservato

: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 453 kB
Formato Adobe PDF
453 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/603682
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 6
  • ???jsp.display-item.citation.isi??? 6
social impact