Carbonate groups and the superconductivity in 123 cuprates Y0.8Ca0.2Ba2Cu3−xCxOy

✍ Scribed by Z. Jirák; J. Hejtmánek; K. Knížek; R. Sonntag

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 597 KB
• Volume: 267
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(96)00392-9

✦ Synopsis

Three ceramic superconductors Y0.sCa0.2Ba2Cu3_xCxO r (x = 0, 0.13 and 0.34) were prepared both in the oxidized and partially reduced forms. The boundaries of the superconducting regions were estimated to y = 6.40, 6.50 and 6.75 for the three systems, respectively. The role of incorporated CO 3 groups has been investigated by means of electric resistivity, thermoelectric power and AC susceptibility measurements and, for the oxidized samples, by neutron diffraction. The presence of the hole type carriers in the CuO 2 planes was analyzed by the bond strength summation.