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Abstract
The influence of high-temperature reduction/oxidation treatment on the structural properties of superconducting PrBa2Cu3O7−δ (PrBCO) single crystals was examined. The scanning electron microscopy (SEM) analysis has shown that even the short-lasting exposure to the oxygen-deficient atmosphere leads to creation of regular-shaped crystallites of PrBaO3 and BaCuO2 phases with the size of 0.5 ÷ 2.0 μm on the smooth and flat crystal surface. The energy dispersive x-ray (EDX) investigations performed on the cross-sections of the superconducting crystals have indicated that the post-growth thermal treatment reduces the amount of Pr on the Ba-sites. Our results strongly support all the concepts attributing the suppression of superconductivity in this system to the excess of Pr in the crystal structure of samples synthesised by the standard methods.
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Authors (4)
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Jan Olchowik
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Details
- Category:
- Magazine publication
- Type:
- Magazine publication
- Publication year:
- 2000
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/s0921-4534(00)00573-6
- Verified by:
- No verification
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