Determination of the valence of Pr in (Eu{sub 1.5{minus}{ital x}}Pr{sub {ital x}}Ce{sub 0.5})Sr{sub 2}Cu{sub 2}NbO{sub 10} superconducting compounds by electron-energy-loss spectroscopy
Journal Article
·
· Physical Review, B: Condensed Matter
- Department of Materials Science and Engineering, Science and Technology Center for Superconductivity, Northwestern University, Evanston, Illinois 60208 (United States)
- Department of Physics, University of California, Davis, California 95616 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
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 (Eu{sub 1.5{minus}{ital x}}Pr{sub {ital x}}Ce{sub 0.5})Sr{sub 2}Cu{sub 2}NbO{sub 10} compounds. EELS analysis, in reference to Ce {ital M}{sub 4,5} edges, clearly indicates that the energy onset, {ital M}{sub 5}/{ital M}{sub 4} intensity ratio and the fine structure of the {ital M}{sub 5} and {ital M}{sub 4} 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 {ital f}-electron hybridization remain viable candidates to explain the lack of superconductivity in Pr-based cuprates. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Lawrence Livermore National Laboratory
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 285244
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 53; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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