Determination of the valence of Pr superconducting compounds by electron-energy-loss spectroscopy

S. Cheng, V. Dravid, T. Goodwin, R. Shelton, H. Radousky

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The issue of the valence state of praseodymium (Pr) in Pr-containing cuprates is addressed using electron-energy-loss spectrometry (EELS) in a transmission electron microscope (TEM) on ((Formula presented)(Formula presented)(Formula presented))(Formula presented)(Formula presented)(Formula presented) compounds. EELS analysis, in reference to Ce (Formula presented) edges, clearly indicates that the energy onset, (Formula presented)/(Formula presented) intensity ratio and the fine structure of the (Formula presented) and (Formula presented) edges of a Pr are consistent with Pr valence of +3. These results eliminate theoretical descriptions on these compounds based upon a Pr +4 valence state and a suppression of carrier states. Localized holes, magnetic interactions, and f-electron hybridization remain viable candidates to explain the lack of superconductivity in Pr-based cuprates.

Original languageEnglish (US)
Pages (from-to)11779-11783
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume53
Issue number17
DOIs
StatePublished - Jan 1 1996

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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