Vacancy-type defects and electronic structure of perovskite-oxide SrTiO 3 from positron annihilation

A. S. Hamid, A. Uedono, T. Chikyow, K. Uwe, K. Mochizuki, S. Kawaminami

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12 Citations (Scopus)

Abstract

The vacancy-type defects in Nb-doped SrTiO 3 and in undoped SrTiO 3, annealed in H 2 flow, were investigated by means of positron lifetime and 2D angular correlation of annihilation radiation (ACAR) experiments. The calculations of the lifetime of positron were performed by using atomic superposition (AT-SUP) method. The results showed that positrons annihilate from a free state in the Nb-doped SrTiO 3. The trapping centers in the annealed sample were found to be oxygen vacancies V o associated with relaxation of the surrounding ions. Moreover, the momentum distributions of the samples studied were correlated to the variation of their electronic structure. It was proposed from the drastic change in the momentum distribution upon introduction of V o, that 2D-ACAR technique is a sensitive tool for acquiring information on the electronic and bond structure of the perovskite-oxides.

Original languageEnglish
Pages (from-to)300-305
Number of pages6
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume203
Issue number2
DOIs
Publication statusPublished - 2006 Feb 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

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