An electron paramagnetic resonance study of superconducting crystals from the Tl-Ca-Ba-Cu-O system
D J Keeble; D S Ginley; E H Poindexter; G J Gerardi; W R Buchwald; D J Keeble; Dept. of Phys., Michigan Technol. Univ., Houghton, MI, USA; D S Ginley; Dept. of Phys., Michigan Technol. Univ., Houghton, MI, USA; E H Poindexter; Dept. of Phys., Michigan Technol. Univ., Houghton, MI, USA; G J Gerardi; Dept. of Phys., Michigan Technol. Univ., Houghton, MI, USA; W R Buchwald; Dept. of Phys., Michigan Technol. Univ., Houghton, MI, USA
Журнал:
Journal of Physics: Condensed Matter
Дата:
1989-10-16
Аннотация:
The authors present the results of electron paramagnetic resonance spectroscopy experiments on superconducting crystals from the Tl-Ca-Ba-Cu-O system. Fourteen crystals were examined. A resonant absorption attributable to Cu<sup>2+</sup> was observed from two of these and was found to be similar to that observed from non-superconducting Tl<sub>2</sub>YBa<sub>2</sub>Cu<sub>2</sub>O<sub>x</sub>. None of the crystals studied showed a resonant absorption consistent with Tl<sup>2+</sup>. The authors interpret the observed resonant absorptions as originating from currently unidentified occlusions of impurity within those crystals.
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