Positron lifetime study of Pr1-xCaxMnO3 (x=0.5, 0.3) during magnetic transition

Research output: Contribution to journalArticle

Abstract

We measured the positron lifetime in perovskite manganites Pr1-xCaxMnO3 (x=0.3, 0.5). Two lifetime components were observed for each compound; they were attributed to the annihilation of free positrons and positrons trapped at the A-site vacancies. The positron lifetime at the A-site vacancies changed significantly during the antiferromagnetic transition in both the compounds, whereas it was constant around the charge-ordering transition. This change indicates that the electron distribution at the vacancies changed possibly due to the change in the electron distribution of neighboring oxygen atoms. This result indicates that positron lifetime measurements can provide unique information on electronic states during a spin-related phase transition in various oxide materials.

Original languageEnglish
Pages (from-to)1092-1095
Number of pages4
JournalRadiation Physics and Chemistry
Volume78
Issue number12
DOIs
Publication statusPublished - 2009 Dec 1

Keywords

  • Antiferromagnetism
  • Magnetism
  • Perovskite manganite
  • Positron annihilation lifetime
  • PrCaMnO
  • Vacancy

ASJC Scopus subject areas

  • Radiation

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