On the absence of bipolarons in manganese perovskites

M. Chipara, R. Skomski, S. H. Liou, P. A. Dowben, S. Adenwalla

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The paramagnetic phase of La0.65Ca0.35MnO3 and La0.65Pb0.35MnO3 powders was investigated by electron spin resonance. The resonance spectra, for a range of temperatures, was used to examine the presence of polarons and bipolarons. The resonance lines are compatible with the presence of polarons (g ≈ 2), but the characteristic high-spin bipolaron lines (g ≈ 4) are absent. The results are inconsistent with the presence of high-spin bipolarons. The evidence with respect to low-spin bipolarons is less conclusive, although the temperature dependence of the resonance line parameters speaks against the presence of low-spin bipolarons.

Original languageEnglish (US)
Pages (from-to)297-301
Number of pages5
JournalMaterials Letters
Volume59
Issue number2-3
DOIs
StatePublished - Feb 2005

Keywords

  • Electron spin resonance
  • Electronic materials
  • Manganese perovskites
  • Polaron/bipolaron

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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